fix(change_detector): add null check in _revertToPreviousState

Closes #1691
dart-archive · Mar 31, 2015 · 0643579 · 0643579
1 parent 97d2f55
commit 0643579
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/change_detection/dirty_checking_change_detector.dart b/lib/change_detection/dirty_checking_change_detector.dart
@@ -1001,7 +1001,7 @@ class _CollectionChangeRecord<V> implements CollectionChangeRecord<V> {
       _linkedRecords.put(record);
     }
 
-    prev._next = null;
+    if (prev != null) prev._next = null;
     _itTail = prev;
     _undoDeltas();
   }