diff --git a/phpBB/includes/auth.php b/phpBB/includes/auth.php
index 356c8bdb74..85328d2bbe 100644
--- a/phpBB/includes/auth.php
+++ b/phpBB/includes/auth.php
@@ -248,12 +248,12 @@ function auth($type, $forum_id, $userdata, $f_access = '')
 						break;
 
 					case AUTH_ACL:
-						$auth_user[$f_forum_id][$key] = ( $userdata['session_logged_in'] ) ? auth_check_user(AUTH_ACL, $key, $u_access[$f_forum_id], $is_admin) : 0;
+						$auth_user[$f_forum_id][$key] = ( $userdata['session_logged_in'] && isset($u_access[$f_forum_id]) ) ? auth_check_user(AUTH_ACL, $key, $u_access[$f_forum_id], $is_admin) : 0;
 						$auth_user[$f_forum_id][$key . '_type'] = $lang['Auth_Users_granted_access'];
 						break;
 
 					case AUTH_MOD:
-						$auth_user[$f_forum_id][$key] = ( $userdata['session_logged_in'] ) ? auth_check_user(AUTH_MOD, 'auth_mod', $u_access[$f_forum_id], $is_admin) : 0;
+						$auth_user[$f_forum_id][$key] = ( $userdata['session_logged_in'] && isset($u_access[$f_forum_id]) ) ? auth_check_user(AUTH_MOD, 'auth_mod', $u_access[$f_forum_id], $is_admin) : 0;
 						$auth_user[$f_forum_id][$key . '_type'] = $lang['Auth_Moderators'];
 						break;
 
@@ -283,7 +283,7 @@ function auth($type, $forum_id, $userdata, $f_access = '')
 		{
 			$f_forum_id = $f_access[$k]['forum_id'];
 
-			$auth_user[$f_forum_id]['auth_mod'] = ( $userdata['session_logged_in'] ) ? auth_check_user(AUTH_MOD, 'auth_mod', $u_access[$f_forum_id], $is_admin) : 0;
+			$auth_user[$f_forum_id]['auth_mod'] = ( $userdata['session_logged_in'] && isset($u_access[$f_forum_id]) ) ? auth_check_user(AUTH_MOD, 'auth_mod', $u_access[$f_forum_id], $is_admin) : 0;
 		}
 	}