From 6b39b25e209d5f0d5c8e123a6bb2e6aec0d621bf Mon Sep 17 00:00:00 2001
From: azt3k <az@dev-io.us>
Date: Fri, 27 Apr 2018 17:14:57 +1200
Subject: [PATCH] Fixes a count() php warning without an api change

Warning: count(): Parameter must be an array or an object that implements Countable in /path/to/vendor/silverstripe/framework/src/Security/Member.php on line 1355
---
 src/Security/Member.php | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Security/Member.php b/src/Security/Member.php
index 38be3f716..7712a692c 100644
--- a/src/Security/Member.php
+++ b/src/Security/Member.php
@@ -1347,6 +1347,12 @@ class Member extends DataObject
      */
     public static function mapInCMSGroups($groups = null)
     {
+        
+        // non-countable $groups will issue a warning when using count() in PHP 7.2+
+        if (!$groups) {
+            $groups = [];
+        }
+            
         // Check CMS module exists
         if (!class_exists(LeftAndMain::class)) {
             return ArrayList::create()->map();