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I had this error when doing login with incorrect username

This is caused in file around line 140 with this code

$sql = 'SELECT *

 FROM ' . USERS_TABLE . "

 WHERE username_clean = '" . $this->db->sql_escape($username_clean) . "'";

 $result = $this->db->sql_query($sql);

 $row = $this->db->sql_fetchrow($result);

 $this->db->sql_freeresult($result);

$row is false, so when executing this like

$show_captcha = $row !== false && ($this->config['max_login_attempts'] && $row['user_login_attempts'] >= $this->config['max_login_attempts']) ||

 ($this->config['ip_login_limit_max'] && $attempts >= $this->config['ip_login_limit_max']);

is not possible to access to false['user_login_attempts']