gistfile1.txt

diff --git a/media/js/zamboni/devhub.js b/media/js/zamboni/devhub.js
index 7ad3a52..90f79d9 100644
--- a/media/js/zamboni/devhub.js
+++ b/media/js/zamboni/devhub.js
@@ -96,7 +96,8 @@ $(document).ready(function() {
     }
 
     // when to start and stop image polling
-    if ($('#edit-addon-media').length) {
+    if ($('#edit-addon-media').length &&
+        $('#edit-addon-media').attr('data-checkurl') !== undefined) {
         imageStatus.start();
     }
     $('#edit-addon-media').bind('click', function() {