diff --git a/lib/widgets/fullscreen/fullscreen_body.dart b/lib/widgets/fullscreen/fullscreen_body.dart
index 8969145ee..a2d43ba01 100644
--- a/lib/widgets/fullscreen/fullscreen_body.dart
+++ b/lib/widgets/fullscreen/fullscreen_body.dart
@@ -112,11 +112,11 @@ class FullscreenBodyState extends State<FullscreenBody> with SingleTickerProvide
   }
 
   void _registerWidget(FullscreenBody widget) {
-    widget.collection.addListener(_onCollectionChange);
+    widget.collection?.addListener(_onCollectionChange);
   }
 
   void _unregisterWidget(FullscreenBody widget) {
-    widget.collection.removeListener(_onCollectionChange);
+    widget.collection?.removeListener(_onCollectionChange);
   }
 
   @override