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10 changes: 4 additions & 6 deletions lib/UserBackend.php
Original file line number Diff line number Diff line change
Expand Up @@ -288,17 +288,15 @@ public function checkPassword(string $uid, string $password) {
*/
private function loadUser($uid) {
$uid = (string)$uid;

// guests $uid could be NULL or ''
// or is not an email anyway
if (strpos($uid, '@') === false) {
$this->cache[$uid] = false;
return false;
}

if (!isset($this->cache[$uid])) {
//guests $uid could be NULL or ''
if ($uid === '') {
$this->cache[$uid] = false;
return true;
}

$qb = $this->dbConn->getQueryBuilder();
$qb->select('uid', 'displayname')
->from('guests_users')
Expand Down