diff --git a/lib/Access.php b/lib/Access.php
index 83143ba8..6c19ec83 100644
--- a/lib/Access.php
+++ b/lib/Access.php
@@ -769,7 +769,8 @@ public function countUsersByLoginName($loginName) {
 	 */
 	public function fetchListOfUsers($filter, $attr, $limit = null, $offset = null) {
 		$ldapRecords = $this->searchUsers($filter, $attr, $limit, $offset);
-		return $this->fetchList($ldapRecords, \count($attr) > 1);
+		$manyAttributes = \is_string($attr) ? false : \count($attr) > 1;
+		return $this->fetchList($ldapRecords, $manyAttributes);
 	}
 
 	/**