diff --git a/AppKit/CPArrayController.j b/AppKit/CPArrayController.j
index 5cf53d08f..5ffd31e19 100644
--- a/AppKit/CPArrayController.j
+++ b/AppKit/CPArrayController.j
@@ -914,11 +914,10 @@
     var newObject = [self automaticallyPreparesContent] ? [self newObject] : [self _defaultNewObject],
         lastSelectedIndex = [_selectionIndexes lastIndex];
 
-    if (lastSelectedIndex != CPNotFound)
+    if (lastSelectedIndex !== CPNotFound)
         [self insertObject:newObject atArrangedObjectIndex:lastSelectedIndex];
     else
         [self addObject:newObject];
-
 }
 
 /*!