diff --git a/src/userTool.js b/src/userTool.js
index dee107b4d30bb99019bbf1acec345b2537796cf3..e54d91d8c9501271f7b86434ab017244da148aa6 100644
--- a/src/userTool.js
+++ b/src/userTool.js
@@ -8,6 +8,7 @@ const m = require('mithril');
 class UserView extends ItemView {
   constructor() {
     super('users');
+    this.memberships = [];
   }
 
   view() {