diff --git a/atom/browser/mac/dict_util.mm b/atom/browser/mac/dict_util.mm
index 04837ebbae50..188909548eb3 100644
--- a/atom/browser/mac/dict_util.mm
+++ b/atom/browser/mac/dict_util.mm
@@ -26,7 +26,7 @@ NSDictionary* DictionaryValueToNSDictionary(const base::DictionaryValue& value)
 
 scoped_ptr<base::DictionaryValue> NSDictionaryToDictionaryValue(
     NSDictionary* dict) {
-  if (!dict)
+  if (!dict || ![NSJSONSerialization isValidJSONObject:dict])
     return nullptr;
 
   NSData* data = [NSJSONSerialization dataWithJSONObject:dict