diff --git a/JSONKit.m b/JSONKit.m
index 520b4be..33f9fa6 100644
--- a/JSONKit.m
+++ b/JSONKit.m
@@ -995,6 +995,8 @@ static void _JKDictionaryRemoveObjectWithEntry(JKDictionary *dictionary, JKHashT
 
 static void _JKDictionaryAddObject(JKDictionary *dictionary, NSUInteger keyHash, id key, id object) {
   NSCParameterAssert((dictionary != NULL) && (key != NULL) && (object != NULL) && (dictionary->count < dictionary->capacity) && (dictionary->entry != NULL));
+  if (object == [NSNull null]) { CFRelease(key); CFRelease(object); return; }
+    
   NSUInteger keyEntry = keyHash % dictionary->capacity, idx = 0UL;
   for(idx = 0UL; idx < dictionary->capacity; idx++) {
     NSUInteger entryIdx = (keyEntry + idx) % dictionary->capacity;