diff --git a/Realm/RLMError.h b/Realm/RLMError.h
index c006ea4b8e..636833c240 100644
--- a/Realm/RLMError.h
+++ b/Realm/RLMError.h
@@ -199,6 +199,10 @@ typedef RLM_ERROR_ENUM(NSInteger, RLMError, RLMErrorDomain) {
      subscription or the server will reject the write.
      */
     RLMErrorNoSubscriptionForWrite = 22,
+     / **
+    Denotes an error that occurs when resolving thread safe reference returns a nil object.
+     */
+    RLMErrorObjectNotFound = 23
 };
 
 #pragma mark - RLMSyncError
diff --git a/Realm/RLMObjectBase.mm b/Realm/RLMObjectBase.mm
index 0cc1b5a114..6e72c23c45 100644
--- a/Realm/RLMObjectBase.mm
+++ b/Realm/RLMObjectBase.mm
@@ -723,6 +723,13 @@ - (void)addNotificationBlock:(RLMObjectNotificationCallback)block
         return;
     }
     RLMObjectBase *obj = [_realm resolveThreadSafeReference:tsr];
+    if (!obj) {
+        error = [NSError errorWithDomain:RLMAppErrorDomain
+                                    code:RLMErrorObjectNotFound
+                                userInfo:nil];
+        block(nil, nil, nil, nil, error);
+        return;
+    }
 
     _object = realm::Object(_realm->_realm, *obj->_info->objectSchema, obj->_row);
     _token = _object.add_notification_callback(ObjectChangeCallbackWrapper{block, obj},