diff --git a/awx/main/queue.py b/awx/main/queue.py
index 57a784321e..d8306c05ba 100644
--- a/awx/main/queue.py
+++ b/awx/main/queue.py
@@ -24,7 +24,7 @@ __all__ = ['CallbackQueueDispatcher']
 class AnsibleJSONEncoder(json.JSONEncoder):
 
     def default(self, o):
-        if getattr(o, 'yaml_tag') == '!vault':
+        if getattr(o, 'yaml_tag', None) == '!vault':
             return o.data
         return super(AnsibleJSONEncoder, self).default(o)