diff --git a/lib/features/home/models/completed_topics_model.dart b/lib/features/home/models/completed_topics_model.dart
index b0d2eac..b7df31d 100644
--- a/lib/features/home/models/completed_topics_model.dart
+++ b/lib/features/home/models/completed_topics_model.dart
@@ -2,7 +2,7 @@ class CompletedTopic {
   final String idSection;
   final String nameSection;
   final String descriptionSection;
-  final String thumbnail;
+  final String? thumbnail;
   final int totalTopics;
   final int completedTopics;
 
@@ -10,7 +10,7 @@ class CompletedTopic {
     required this.idSection,
     required this.nameSection,
     required this.descriptionSection,
-    required this.thumbnail,
+    this.thumbnail,
     required this.totalTopics,
     required this.completedTopics,
   });
diff --git a/lib/features/home/widgets/progress_card.dart b/lib/features/home/widgets/progress_card.dart
index 69aa711..d528218 100644
--- a/lib/features/home/widgets/progress_card.dart
+++ b/lib/features/home/widgets/progress_card.dart
@@ -115,7 +115,7 @@ class ProgressCard extends StatelessWidget {
               ClipRRect(
                 borderRadius: BorderRadius.circular(8),
                 child: Image.network(
-                  _getFullImageUrl(topic.thumbnail),
+                  _getFullImageUrl(topic.thumbnail ?? ''),
                   width: 90,
                   height: 130,
                   fit: BoxFit.cover,