diff --git a/phpgwapi/inc/class.acl.inc.php b/phpgwapi/inc/class.acl.inc.php
index 15a020cf5b..72d6d5ad2e 100644
--- a/phpgwapi/inc/class.acl.inc.php
+++ b/phpgwapi/inc/class.acl.inc.php
@@ -409,7 +409,7 @@
 		{
 			static $cache_accountid;
 
-			if($cache_accountid[$accountid])
+			if(isset($cache_accountid[$accountid]) && $cache_accountid[$accountid])
 			{
 				$account_id = $cache_accountid[$accountid];
 			}
@@ -528,6 +528,7 @@
 					$accounts[] = intval($this->db->f('acl_account'));
 				}
 			}
+			@reset($accounts);
 			return $accounts;
 		}