diff --git a/lib/Handlers/GroupsLoader.php b/lib/Handlers/GroupsLoader.php
old mode 100644
new mode 100755
index d4ad427..4143217
--- a/lib/Handlers/GroupsLoader.php
+++ b/lib/Handlers/GroupsLoader.php
@@ -38,6 +38,10 @@ public function getUserGroups(Manager $ldap, array $userData)
 
 		// Merge the two and return
 		foreach($memberOf as $dn => $name) {
+			if(!isset($allGroups[$dn])) {
+				continue;
+			}
+
 			$memberOf[$dn] = $allGroups[$dn];
 		}