From dfd75efbe5ac6bc318ecd6e8b1d239110e49bee1 Mon Sep 17 00:00:00 2001
From: Matias Griese <matias@trilbymedia.com>
Date: Wed, 10 Apr 2019 20:59:13 +0300
Subject: [PATCH] Fixed join() in flex user

---
 system/src/Grav/Common/User/FlexUser/User.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/system/src/Grav/Common/User/FlexUser/User.php b/system/src/Grav/Common/User/FlexUser/User.php
index 49084eb94..5ef381912 100644
--- a/system/src/Grav/Common/User/FlexUser/User.php
+++ b/system/src/Grav/Common/User/FlexUser/User.php
@@ -245,6 +245,7 @@ class User extends FlexObject implements UserInterface, MediaManipulationInterfa
      */
     public function join($name, $value, $separator = null)
     {
+        $separator = $separator ?? '.';
         $old = $this->get($name, null, $separator);
         if ($old !== null) {
             if (!\is_array($old)) {