diff --git a/app/shared/responseHandlers.js b/app/shared/responseHandlers.js
index 16bdc248a..8b60fea6f 100644
--- a/app/shared/responseHandlers.js
+++ b/app/shared/responseHandlers.js
@@ -56,7 +56,7 @@ function deleteImageHandler(data) {
     response.push({message: data});
   }
   // A JSON object is returned on failure (Docker = 1.12)
-  else if (!isJSONArray) {
+  else if (!isJSONArray(data)) {
     var json = angular.fromJson(data);
     response.push(json);
   }