diff --git a/kolla/image/build.py b/kolla/image/build.py
index fa0843f..f010e2f 100755
--- a/kolla/image/build.py
+++ b/kolla/image/build.py
@@ -1115,6 +1115,6 @@ def run_build():

     results = kolla.summary()
     kolla.cleanup()
-    if conf.format == 'json':
+    if conf is not None and conf.debug and conf.format == 'json':
         print(json.dumps(results))
     return kolla.get_image_statuses()