diff --git a/package.json b/package.json
index f20dfe8a79532..fbf3f9f5f4cd7 100644
--- a/package.json
+++ b/package.json
@@ -129,7 +129,7 @@
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-compress": "^0.13.0",
     "grunt-contrib-copy": "^0.8.0",
-    "grunt-esvm": "^1.0.1",
+    "grunt-esvm": "^1.1.3",
     "grunt-karma": "^0.12.0",
     "grunt-replace": "^0.7.9",
     "grunt-run": "spalger/grunt-run#master",
diff --git a/src/ui/UiApps.js b/src/ui/UiApps.js
index 8ec2dd8612d6d..a94ff7c614691 100644
--- a/src/ui/UiApps.js
+++ b/src/ui/UiApps.js
@@ -39,4 +39,8 @@ module.exports = class UiApps extends Array {
     return this._byId || (this._byId = _.indexBy(this, 'id'));
   }
 
+  toJSON() {
+    return this.slice(0);
+  }
+
 };