1 files changed, 1 insertions, 1 deletions
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 7d68ed84..01340419 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -71,7 +71,7 @@ class Backend {
             return promise.then(result => {
                 callback({result});
             }).catch(error => {
-                callback({error});
+                callback({error: error.toString ? error.toString() : error});
             });
         };