diff --git a/MASFoundation/Vendor/MASIOrderedDictionary/MASIOrderedDictionary.m b/MASFoundation/Vendor/MASIOrderedDictionary/MASIOrderedDictionary.m
index 2847c537..ada57bed 100755
--- a/MASFoundation/Vendor/MASIOrderedDictionary/MASIOrderedDictionary.m
+++ b/MASFoundation/Vendor/MASIOrderedDictionary/MASIOrderedDictionary.m
@@ -325,7 +325,7 @@ - (void)setObject:(id)object forKey:(id)key
     {
         _mutableValues[index] = object;
     }
-    else
+    else if (object)
     {
         [_mutableKeys addObject:key];
         [_mutableValues addObject:object];