--- a/devtools/client/storage/ui.js
+++ b/devtools/client/storage/ui.js
@@ -165,16 +165,18 @@ StorageUI.prototype = {
   },
 
   makeFieldsEditable: function() {
     let actor = this.getCurrentActor();
 
     if (typeof actor.getEditableFields !== "undefined") {
       actor.getEditableFields().then(fields => {
         this.table.makeFieldsEditable(fields);
+      }).then(() => {
+        // Do nothing
       });
     } else if (this.table._editableFieldsEngine) {
       this.table._editableFieldsEngine.destroy();
     }
   },
 
   editItem: function(eventType, data) {
     let actor = this.getCurrentActor();