diff --git a/lib/common/promise.ts b/lib/common/promise.ts
index ebf7d84c2..bad45acea 100644
--- a/lib/common/promise.ts
+++ b/lib/common/promise.ts
@@ -27,8 +27,9 @@ Zone.__load_patch('ZoneAwarePromise', (global: any, Zone: ZoneType, api: _ZonePr
             rejection instanceof Error ? rejection.message : rejection, '; Zone:',
             (<Zone>e.zone).name, '; Task:', e.task && (<Task>e.task).source, '; Value:', rejection,
             rejection instanceof Error ? rejection.stack : undefined);
+      } else {
+        console.error(e);
       }
-      console.error(e);
     }
   };