diff --git a/packages/flutter_timeline_interface/lib/src/model/timeline_post.dart b/packages/flutter_timeline_interface/lib/src/model/timeline_post.dart
index df7b7e9..4f50c09 100644
--- a/packages/flutter_timeline_interface/lib/src/model/timeline_post.dart
+++ b/packages/flutter_timeline_interface/lib/src/model/timeline_post.dart
@@ -34,7 +34,7 @@ class TimelinePost {
         id: id,
         creatorId: json['creator_id'] as String,
         title: json['title'] as String,
-        category: json['category'] as String,
+        category: json['category'] as String?,
         imageUrl: json['image_url'] as String?,
         content: json['content'] as String,
         likes: json['likes'] as int,