diff --git a/.github/workflows/melos-ci.yml b/.github/workflows/melos-ci.yml
index dab1703..a7ad1d2 100644
--- a/.github/workflows/melos-ci.yml
+++ b/.github/workflows/melos-ci.yml
@@ -12,4 +12,3 @@ jobs:
     permissions: write-all
     with:
       subfolder: '.' # add optional subfolder to run workflow in
-      flutter_version: 3.19.6
diff --git a/packages/chat_repository_interface/lib/src/local/local_user_repository.dart b/packages/chat_repository_interface/lib/src/local/local_user_repository.dart
index c57ef7f..f68fbc2 100644
--- a/packages/chat_repository_interface/lib/src/local/local_user_repository.dart
+++ b/packages/chat_repository_interface/lib/src/local/local_user_repository.dart
@@ -10,25 +10,25 @@ class LocalUserRepository implements UserRepositoryInterface {
       BehaviorSubject<List<UserModel>>();
 
   final List<UserModel> _users = [
-    UserModel(
+    const UserModel(
       id: "1",
       firstName: "John",
       lastName: "Doe",
       imageUrl: "https://picsum.photos/200/300",
     ),
-    UserModel(
+    const UserModel(
       id: "2",
       firstName: "Jane",
       lastName: "Doe",
       imageUrl: "https://picsum.photos/200/300",
     ),
-    UserModel(
+    const UserModel(
       id: "3",
       firstName: "Frans",
       lastName: "Timmermans",
       imageUrl: "https://picsum.photos/200/300",
     ),
-    UserModel(
+    const UserModel(
       id: "4",
       firstName: "Hendrik-Jan",
       lastName: "De derde",
diff --git a/packages/chat_repository_interface/lib/src/models/chat_model.dart b/packages/chat_repository_interface/lib/src/models/chat_model.dart
index b523498..d74573f 100644
--- a/packages/chat_repository_interface/lib/src/models/chat_model.dart
+++ b/packages/chat_repository_interface/lib/src/models/chat_model.dart
@@ -25,6 +25,22 @@ class ChatModel {
     this.unreadMessageCount = 0,
   });
 
+  /// The factory chat model that creates a chat model from a map
+  factory ChatModel.fromMap(String id, Map<String, dynamic> data) => ChatModel(
+        id: id,
+        users: List<String>.from(data["users"]),
+        isGroupChat: data["isGroupChat"],
+        chatName: data["chatName"],
+        description: data["description"],
+        imageUrl: data["imageUrl"],
+        canBeDeleted: data["canBeDeleted"] ?? true,
+        lastUsed: data["lastUsed"] != null
+            ? DateTime.fromMillisecondsSinceEpoch(data["lastUsed"])
+            : null,
+        lastMessage: data["lastMessage"],
+        unreadMessageCount: data["unreadMessageCount"] ?? 0,
+      );
+
   /// The chat id
   final String id;
 
@@ -81,34 +97,16 @@ class ChatModel {
         unreadMessageCount: unreadMessageCount ?? this.unreadMessageCount,
       );
 
-  /// The factory chat model that creates a chat model from a map
-  factory ChatModel.fromMap(String id, Map<String, dynamic> data) {
-    return ChatModel(
-      id: id,
-      users: List<String>.from(data['users']),
-      isGroupChat: data['isGroupChat'],
-      chatName: data['chatName'],
-      description: data['description'],
-      imageUrl: data['imageUrl'],
-      canBeDeleted: data['canBeDeleted'] ?? true,
-      lastUsed: data['lastUsed'] != null
-          ? DateTime.fromMillisecondsSinceEpoch(data['lastUsed'])
-          : null,
-      lastMessage: data['lastMessage'],
-      unreadMessageCount: data['unreadMessageCount'] ?? 0,
-    );
-  }
-
   Map<String, dynamic> toMap() => {
-        'users': users,
-        'isGroupChat': isGroupChat,
-        'chatName': chatName,
-        'description': description,
-        'imageUrl': imageUrl,
-        'canBeDeleted': canBeDeleted,
-        'lastUsed': lastUsed?.millisecondsSinceEpoch,
-        'lastMessage': lastMessage,
-        'unreadMessageCount': unreadMessageCount,
+        "users": users,
+        "isGroupChat": isGroupChat,
+        "chatName": chatName,
+        "description": description,
+        "imageUrl": imageUrl,
+        "canBeDeleted": canBeDeleted,
+        "lastUsed": lastUsed?.millisecondsSinceEpoch,
+        "lastMessage": lastMessage,
+        "unreadMessageCount": unreadMessageCount,
       };
 }
 
diff --git a/packages/chat_repository_interface/lib/src/models/message_model.dart b/packages/chat_repository_interface/lib/src/models/message_model.dart
index ce9a25d..b0329f5 100644
--- a/packages/chat_repository_interface/lib/src/models/message_model.dart
+++ b/packages/chat_repository_interface/lib/src/models/message_model.dart
@@ -15,6 +15,17 @@ class MessageModel {
     required this.timestamp,
     required this.senderId,
   });
+
+  factory MessageModel.fromMap(String id, Map<String, dynamic> map) =>
+      MessageModel(
+        chatId: map["chatId"],
+        id: id,
+        text: map["text"],
+        imageUrl: map["imageUrl"],
+        timestamp: DateTime.fromMillisecondsSinceEpoch(map["timestamp"]),
+        senderId: map["senderId"],
+      );
+
   /// The chat id
   final String chatId;
 
@@ -51,26 +62,13 @@ class MessageModel {
         senderId: senderId ?? this.senderId,
       );
 
-  factory MessageModel.fromMap(String id, Map<String, dynamic> map) {
-    return MessageModel(
-      chatId: map['chatId'],
-      id: id,
-      text: map['text'],
-      imageUrl: map['imageUrl'],
-      timestamp: DateTime.fromMillisecondsSinceEpoch(map['timestamp']),
-      senderId: map['senderId'],
-    );
-  }
-
-  Map<String, dynamic> toMap() {
-    return {
-      'chatId': chatId,
-      'text': text,
-      'imageUrl': imageUrl,
-      'timestamp': timestamp.millisecondsSinceEpoch,
-      'senderId': senderId,
-    };
-  }
+  Map<String, dynamic> toMap() => {
+        "chatId": chatId,
+        "text": text,
+        "imageUrl": imageUrl,
+        "timestamp": timestamp.millisecondsSinceEpoch,
+        "senderId": senderId,
+      };
 }
 
 /// Extension on [MessageModel] to check the message type
diff --git a/packages/chat_repository_interface/lib/src/models/user_model.dart b/packages/chat_repository_interface/lib/src/models/user_model.dart
index 3673615..b8b664b 100644
--- a/packages/chat_repository_interface/lib/src/models/user_model.dart
+++ b/packages/chat_repository_interface/lib/src/models/user_model.dart
@@ -14,6 +14,13 @@ class UserModel {
     this.imageUrl,
   });
 
+  factory UserModel.fromMap(String id, Map<String, dynamic> data) => UserModel(
+        id: id,
+        firstName: data["firstName"],
+        lastName: data["lastName"],
+        imageUrl: data["imageUrl"],
+      );
+
   /// The user id
   final String id;
 
@@ -25,15 +32,6 @@ class UserModel {
 
   /// The user image url
   final String? imageUrl;
-
-  factory UserModel.fromMap(String id, Map<String, dynamic> data) {
-    return UserModel(
-      id: id,
-      firstName: data['firstName'],
-      lastName: data['lastName'],
-      imageUrl: data['imageUrl'],
-    );
-  }
 }
 
 /// Extension on [UserModel] to get the user full name
diff --git a/packages/chat_repository_interface/lib/src/services/chat_service.dart b/packages/chat_repository_interface/lib/src/services/chat_service.dart
index 5113b01..e542ee4 100644
--- a/packages/chat_repository_interface/lib/src/services/chat_service.dart
+++ b/packages/chat_repository_interface/lib/src/services/chat_service.dart
@@ -188,9 +188,8 @@ class ChatService {
   /// Returns a [Stream] of [int].
   Stream<int> getUnreadMessagesCount({
     required String userId,
-  }) {
-    return chatRepository.getUnreadMessagesCount(userId: userId);
-  }
+  }) =>
+      chatRepository.getUnreadMessagesCount(userId: userId);
 
   /// Upload an image with the given parameters.
   /// [path] is the image path.
diff --git a/packages/firebase_chat_repository/lib/firebase_chat_repository.dart b/packages/firebase_chat_repository/lib/firebase_chat_repository.dart
index 0257c1d..e6effcb 100644
--- a/packages/firebase_chat_repository/lib/firebase_chat_repository.dart
+++ b/packages/firebase_chat_repository/lib/firebase_chat_repository.dart
@@ -1,2 +1,2 @@
-export 'src/firebase_chat_repository.dart';
-export 'src/firebase_user_repository.dart';
+export "src/firebase_chat_repository.dart";
+export "src/firebase_user_repository.dart";
diff --git a/packages/firebase_chat_repository/lib/src/firebase_chat_repository.dart b/packages/firebase_chat_repository/lib/src/firebase_chat_repository.dart
index ec26ad4..28a70f4 100644
--- a/packages/firebase_chat_repository/lib/src/firebase_chat_repository.dart
+++ b/packages/firebase_chat_repository/lib/src/firebase_chat_repository.dart
@@ -1,25 +1,24 @@
-import 'dart:typed_data';
+import "dart:typed_data";
 
-import 'package:chat_repository_interface/chat_repository_interface.dart';
-import 'package:cloud_firestore/cloud_firestore.dart';
-import 'package:firebase_storage/firebase_storage.dart';
+import "package:chat_repository_interface/chat_repository_interface.dart";
+import "package:cloud_firestore/cloud_firestore.dart";
+import "package:firebase_storage/firebase_storage.dart";
 
 class FirebaseChatRepository implements ChatRepositoryInterface {
+  FirebaseChatRepository({
+    FirebaseFirestore? firestore,
+    FirebaseStorage? storage,
+    this.chatCollection = "chats",
+    this.messageCollection = "messages",
+    this.mediaPath = "chat",
+  })  : _firestore = firestore ?? FirebaseFirestore.instance,
+        _storage = storage ?? FirebaseStorage.instance;
   final FirebaseFirestore _firestore;
   final FirebaseStorage _storage;
   final String chatCollection;
   final String messageCollection;
   final String mediaPath;
 
-  FirebaseChatRepository({
-    FirebaseFirestore? firestore,
-    FirebaseStorage? storage,
-    this.chatCollection = 'chats',
-    this.messageCollection = 'messages',
-    this.mediaPath = 'chat',
-  })  : _firestore = firestore ?? FirebaseFirestore.instance,
-        _storage = storage ?? FirebaseStorage.instance;
-
   @override
   Future<void> createChat({
     required List<String> users,
@@ -29,13 +28,13 @@ class FirebaseChatRepository implements ChatRepositoryInterface {
     String? imageUrl,
     List<MessageModel>? messages,
   }) async {
-    final chatData = {
-      'users': users,
-      'isGroupChat': isGroupChat,
-      'chatName': chatName,
-      'description': description,
-      'imageUrl': imageUrl,
-      'createdAt': DateTime.now().millisecondsSinceEpoch,
+    var chatData = {
+      "users": users,
+      "isGroupChat": isGroupChat,
+      "chatName": chatName,
+      "description": description,
+      "imageUrl": imageUrl,
+      "createdAt": DateTime.now().millisecondsSinceEpoch,
     };
     await _firestore.collection(chatCollection).add(chatData);
   }
@@ -46,48 +45,45 @@ class FirebaseChatRepository implements ChatRepositoryInterface {
   }
 
   @override
-  Stream<ChatModel> getChat({required String chatId}) {
-    return _firestore
-        .collection(chatCollection)
-        .doc(chatId)
-        .snapshots()
-        .map((snapshot) {
-      var data = snapshot.data() as Map<String, dynamic>;
-      return ChatModel.fromMap(snapshot.id, data);
-    });
-  }
+  Stream<ChatModel> getChat({required String chatId}) => _firestore
+          .collection(chatCollection)
+          .doc(chatId)
+          .snapshots()
+          .map((snapshot) {
+        var data = snapshot.data()!;
+        return ChatModel.fromMap(snapshot.id, data);
+      });
 
   @override
-  Stream<List<ChatModel>?> getChats({required String userId}) {
-    return _firestore
-        .collection(chatCollection)
-        .where('users', arrayContains: userId)
-        .snapshots()
-        .map((querySnapshot) {
-      return querySnapshot.docs.map((doc) {
-        var data = doc.data();
-        return ChatModel.fromMap(doc.id, data);
-      }).toList();
-    });
-  }
-
-  @override
-  Stream<MessageModel?> getMessage(
-      {required String chatId, required String messageId}) {
-    return _firestore
-        .collection(chatCollection)
-        .doc(chatId)
-        .collection(messageCollection)
-        .doc(messageId)
-        .snapshots()
-        .map((snapshot) {
-      var data = snapshot.data() as Map<String, dynamic>;
-      return MessageModel.fromMap(
-        snapshot.id,
-        data,
+  Stream<List<ChatModel>?> getChats({required String userId}) => _firestore
+      .collection(chatCollection)
+      .where("users", arrayContains: userId)
+      .snapshots()
+      .map(
+        (querySnapshot) => querySnapshot.docs.map((doc) {
+          var data = doc.data();
+          return ChatModel.fromMap(doc.id, data);
+        }).toList(),
       );
-    });
-  }
+
+  @override
+  Stream<MessageModel?> getMessage({
+    required String chatId,
+    required String messageId,
+  }) =>
+      _firestore
+          .collection(chatCollection)
+          .doc(chatId)
+          .collection(messageCollection)
+          .doc(messageId)
+          .snapshots()
+          .map((snapshot) {
+        var data = snapshot.data()!;
+        return MessageModel.fromMap(
+          snapshot.id,
+          data,
+        );
+      });
 
   @override
   Stream<List<MessageModel>?> getMessages({
@@ -95,41 +91,46 @@ class FirebaseChatRepository implements ChatRepositoryInterface {
     required String userId,
     required int pageSize,
     required int page,
-  }) {
-    return _firestore
-        .collection(chatCollection)
-        .doc(chatId)
-        .collection(messageCollection)
-        .orderBy('timestamp')
-        .limit(pageSize)
-        .snapshots()
-        .map((query) => query.docs
-            .map((snapshot) => MessageModel.fromMap(
-                  snapshot.id,
-                  snapshot.data(),
-                ))
-            .toList());
-  }
+  }) =>
+      _firestore
+          .collection(chatCollection)
+          .doc(chatId)
+          .collection(messageCollection)
+          .orderBy("timestamp")
+          .limit(pageSize)
+          .snapshots()
+          .map(
+            (query) => query.docs
+                .map(
+                  (snapshot) => MessageModel.fromMap(
+                    snapshot.id,
+                    snapshot.data(),
+                  ),
+                )
+                .toList(),
+          );
 
   @override
-  Stream<int> getUnreadMessagesCount(
-      {required String userId, String? chatId}) async* {
+  Stream<int> getUnreadMessagesCount({
+    required String userId,
+    String? chatId,
+  }) async* {
     var query = _firestore
         .collection(chatCollection)
-        .where('users', arrayContains: userId)
-        .where('unreadMessageCount', isGreaterThan: 0)
+        .where("users", arrayContains: userId)
+        .where("unreadMessageCount", isGreaterThan: 0)
         .snapshots();
 
     await for (var snapshot in query) {
       var count = 0;
       for (var doc in snapshot.docs) {
         var data = doc.data();
-        var lastMessageKey = data['lastMessage'];
+        var lastMessageKey = data["lastMessage"];
 
         var message =
             await getMessage(chatId: doc.id, messageId: lastMessageKey).first;
         if (message?.senderId != userId) {
-          count += data['unreadMessageCount'] as int;
+          count += data["unreadMessageCount"] as int;
         }
       }
 
@@ -147,12 +148,13 @@ class FirebaseChatRepository implements ChatRepositoryInterface {
     DateTime? timestamp,
   }) async {
     var message = MessageModel(
-        chatId: chatId,
-        id: messageId,
-        text: text,
-        imageUrl: imageUrl,
-        timestamp: timestamp ?? DateTime.now(),
-        senderId: senderId);
+      chatId: chatId,
+      id: messageId,
+      text: text,
+      imageUrl: imageUrl,
+      timestamp: timestamp ?? DateTime.now(),
+      senderId: senderId,
+    );
 
     await _firestore
         .collection(chatCollection)
@@ -165,9 +167,9 @@ class FirebaseChatRepository implements ChatRepositoryInterface {
 
     await _firestore.collection(chatCollection).doc(chatId).update(
       {
-        'lastMessage': messageId,
-        'unreadMessageCount': FieldValue.increment(1),
-        'lastUsed': DateTime.now().millisecondsSinceEpoch,
+        "lastMessage": messageId,
+        "unreadMessageCount": FieldValue.increment(1),
+        "lastUsed": DateTime.now().millisecondsSinceEpoch,
       },
     );
   }
@@ -181,11 +183,13 @@ class FirebaseChatRepository implements ChatRepositoryInterface {
   }
 
   @override
-  Future<String> uploadImage(
-      {required String path, required Uint8List image}) async {
-    final ref = _storage.ref().child(mediaPath).child(path);
-    final uploadTask = ref.putData(image);
-    final snapshot = await uploadTask.whenComplete(() => {});
-    return await snapshot.ref.getDownloadURL();
+  Future<String> uploadImage({
+    required String path,
+    required Uint8List image,
+  }) async {
+    var ref = _storage.ref().child(mediaPath).child(path);
+    var uploadTask = ref.putData(image);
+    var snapshot = await uploadTask.whenComplete(() => {});
+    return snapshot.ref.getDownloadURL();
   }
 }
diff --git a/packages/firebase_chat_repository/lib/src/firebase_user_repository.dart b/packages/firebase_chat_repository/lib/src/firebase_user_repository.dart
index 7a25aef..58f8128 100644
--- a/packages/firebase_chat_repository/lib/src/firebase_user_repository.dart
+++ b/packages/firebase_chat_repository/lib/src/firebase_user_repository.dart
@@ -1,41 +1,33 @@
-import 'package:chat_repository_interface/chat_repository_interface.dart';
-import 'package:cloud_firestore/cloud_firestore.dart';
+import "package:chat_repository_interface/chat_repository_interface.dart";
+import "package:cloud_firestore/cloud_firestore.dart";
 
 class FirebaseUserRepository implements UserRepositoryInterface {
+  FirebaseUserRepository({
+    FirebaseFirestore? firestore,
+    this.userCollection = "users",
+  }) : _firestore = firestore ?? FirebaseFirestore.instance;
   final FirebaseFirestore _firestore;
   final String userCollection;
 
-  FirebaseUserRepository({
-    FirebaseFirestore? firestore,
-    this.userCollection = 'users',
-  }) : _firestore = firestore ?? FirebaseFirestore.instance;
+  @override
+  Stream<List<UserModel>> getAllUsers() =>
+      _firestore.collection(userCollection).snapshots().map(
+            (querySnapshot) => querySnapshot.docs
+                .map(
+                  (doc) => UserModel.fromMap(
+                    doc.id,
+                    doc.data(),
+                  ),
+                )
+                .toList(),
+          );
 
   @override
-  Stream<List<UserModel>> getAllUsers() {
-    return _firestore
-        .collection(userCollection)
-        .snapshots()
-        .map((querySnapshot) {
-      return querySnapshot.docs
-          .map((doc) => UserModel.fromMap(
-                doc.id,
-                doc.data(),
-              ))
-          .toList();
-    });
-  }
-
-  @override
-  Stream<UserModel> getUser({required String userId}) {
-    return _firestore
-        .collection(userCollection)
-        .doc(userId)
-        .snapshots()
-        .map((snapshot) {
-      return UserModel.fromMap(
-        snapshot.id,
-        snapshot.data() as Map<String, dynamic>,
-      );
-    });
-  }
+  Stream<UserModel> getUser({required String userId}) =>
+      _firestore.collection(userCollection).doc(userId).snapshots().map(
+            (snapshot) => UserModel.fromMap(
+              snapshot.id,
+              snapshot.data()!,
+            ),
+          );
 }
diff --git a/packages/flutter_chat/example/pubspec.yaml b/packages/flutter_chat/example/pubspec.yaml
index e285bac..db0bbd0 100644
--- a/packages/flutter_chat/example/pubspec.yaml
+++ b/packages/flutter_chat/example/pubspec.yaml
@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: ^3.5.0
+  sdk: ^3.4.3
 
 dependencies:
   flutter:
diff --git a/packages/flutter_chat/lib/src/config/chat_translations.dart b/packages/flutter_chat/lib/src/config/chat_translations.dart
index 2113167..fb0685f 100644
--- a/packages/flutter_chat/lib/src/config/chat_translations.dart
+++ b/packages/flutter_chat/lib/src/config/chat_translations.dart
@@ -56,7 +56,7 @@ class ChatTranslations {
     this.chatsTitle = "Chats",
     this.chatsUnread = "unread",
     this.newChatButton = "Start chat",
-    this.newGroupChatButton = "Create a groupchat",
+    this.newGroupChatButton = "Start a groupchat",
     this.newChatTitle = "Start a chat",
     this.image = "Image",
     this.searchPlaceholder = "Search...",
diff --git a/packages/flutter_chat/lib/src/config/screen_types.dart b/packages/flutter_chat/lib/src/config/screen_types.dart
index 7ae873c..6f1c03c 100644
--- a/packages/flutter_chat/lib/src/config/screen_types.dart
+++ b/packages/flutter_chat/lib/src/config/screen_types.dart
@@ -1,10 +1,10 @@
-import 'package:flutter/material.dart';
-import 'package:flutter_chat/src/screens/chat_detail_screen.dart';
-import 'package:flutter_chat/src/screens/chat_profile_screen.dart';
-import 'package:flutter_chat/src/screens/chat_screen.dart';
-import 'package:flutter_chat/src/screens/creation/new_chat_screen.dart';
-import 'package:flutter_chat/src/screens/creation/new_group_chat_overview.dart';
-import 'package:flutter_chat/src/screens/creation/new_group_chat_screen.dart';
+import "package:flutter/material.dart";
+import "package:flutter_chat/src/screens/chat_detail_screen.dart";
+import "package:flutter_chat/src/screens/chat_profile_screen.dart";
+import "package:flutter_chat/src/screens/chat_screen.dart";
+import "package:flutter_chat/src/screens/creation/new_chat_screen.dart";
+import "package:flutter_chat/src/screens/creation/new_group_chat_overview.dart";
+import "package:flutter_chat/src/screens/creation/new_group_chat_screen.dart";
 
 enum ScreenType {
   chatScreen(screen: ChatScreen),
@@ -22,7 +22,6 @@ enum ScreenType {
 }
 
 extension MapFromWidget on Widget {
-  ScreenType get mapScreenType {
-    return ScreenType.values.firstWhere((e) => e.screen == this.runtimeType);
-  }
+  ScreenType get mapScreenType =>
+      ScreenType.values.firstWhere((e) => e.screen == runtimeType);
 }
diff --git a/packages/flutter_chat/lib/src/flutter_chat_navigator_userstory.dart b/packages/flutter_chat/lib/src/flutter_chat_navigator_userstory.dart
index b0b1a80..256a63a 100644
--- a/packages/flutter_chat/lib/src/flutter_chat_navigator_userstory.dart
+++ b/packages/flutter_chat/lib/src/flutter_chat_navigator_userstory.dart
@@ -117,7 +117,9 @@ class _NavigatorWrapper extends StatelessWidget {
             route(context, chatProfileScreen(context, user, null)),
         onUploadImage: (data) async {
           var path = await chatService.uploadImage(
-              path: "chats/${chat.id}-$userId-${DateTime.now()}", image: data);
+            path: "chats/${chat.id}-$userId-${DateTime.now()}",
+            image: data,
+          );
 
           await chatService.sendMessage(
             messageId: "${chat.id}-$userId-${DateTime.now()}",
@@ -191,7 +193,9 @@ class _NavigatorWrapper extends StatelessWidget {
           String? path;
           if (image != null) {
             path = await chatService.uploadImage(
-                path: "groups/$title", image: image);
+              path: "groups/$title",
+              image: image,
+            );
           }
           var chat = await createGroupChat(
             users,
diff --git a/packages/flutter_chat/lib/src/screens/chat_profile_screen.dart b/packages/flutter_chat/lib/src/screens/chat_profile_screen.dart
index 81ad20f..eb4dcaf 100644
--- a/packages/flutter_chat/lib/src/screens/chat_profile_screen.dart
+++ b/packages/flutter_chat/lib/src/screens/chat_profile_screen.dart
@@ -63,7 +63,7 @@ class ChatProfileScreen extends StatelessWidget {
 
     return options.builders.baseScreenBuilder!.call(
       context,
-      this.mapScreenType,
+      mapScreenType,
       _AppBar(
         user: userModel,
         chat: chatModel,
@@ -288,7 +288,7 @@ class _Body extends StatelessWidget {
             ],
           ],
         ),
-        if (user?.id != currentUser) ...[
+        if (user != null && user?.id != currentUser) ...[
           Align(
             alignment: Alignment.bottomCenter,
             child: Padding(
diff --git a/packages/flutter_chat/lib/src/screens/chat_screen.dart b/packages/flutter_chat/lib/src/screens/chat_screen.dart
index ac1dd84..88d6e8d 100644
--- a/packages/flutter_chat/lib/src/screens/chat_screen.dart
+++ b/packages/flutter_chat/lib/src/screens/chat_screen.dart
@@ -60,7 +60,7 @@ class ChatScreen extends StatelessWidget {
 
     return chatOptions.builders.baseScreenBuilder!.call(
       context,
-      this.mapScreenType,
+      mapScreenType,
       _AppBar(
         userId: userId,
         chatOptions: chatOptions,
diff --git a/packages/flutter_chat/lib/src/screens/creation/new_group_chat_overview.dart b/packages/flutter_chat/lib/src/screens/creation/new_group_chat_overview.dart
index 4612053..0645542 100644
--- a/packages/flutter_chat/lib/src/screens/creation/new_group_chat_overview.dart
+++ b/packages/flutter_chat/lib/src/screens/creation/new_group_chat_overview.dart
@@ -50,7 +50,7 @@ class NewGroupChatOverview extends StatelessWidget {
 
     return options.builders.baseScreenBuilder!.call(
       context,
-      this.mapScreenType,
+      mapScreenType,
       _AppBar(
         options: options,
       ),