diff --git a/js/apps/system/users/errors.js b/js/apps/system/users/errors.js
index 59a268dd22..b8fb47e405 100644
--- a/js/apps/system/users/errors.js
+++ b/js/apps/system/users/errors.js
@@ -5,11 +5,17 @@
 
   function UserNotFound(uid) {
     this.message = 'User with user id ' + uid + ' not found.';
+    var err = new Error(this.message);
+    err.name = this.constructor.name;
+    this.stack = err.stack;
   }
   UserNotFound.prototype = new Error();
 
   function UsernameNotAvailable(username) {
     this.message = 'The username ' + username + ' is not available or already taken.';
+    var err = new Error(this.message);
+    err.name = this.constructor.name;
+    this.stack = err.stack;
   }
   UsernameNotAvailable.prototype = new Error();