Błądy przy debugowaniu

Witam,
Przy szukaniu przyczyny dla czego strona długo się wczytuje i dla czego dostaje błąd 504 dostaje takie informację

[23-May-2022 14:29:19 UTC] PHP Deprecated:  setcookie(): Passing null to parameter #5 ($domain) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/option.php on line 1109
[23-May-2022 14:29:19 UTC] PHP Deprecated:  setcookie(): Passing null to parameter #5 ($domain) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/option.php on line 1110
[23-May-2022 14:29:19 UTC] PHP Deprecated:  rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/formatting.php on line 2761
[23-May-2022 14:29:19 UTC] PHP Deprecated:  rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/formatting.php on line 2761
[23-May-2022 14:29:19 UTC] PHP Deprecated:  rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/formatting.php on line 2761
[23-May-2022 14:29:19 UTC] PHP Deprecated:  rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/formatting.php on line 2761
[23-May-2022 14:29:19 UTC] PHP Deprecated:  rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/formatting.php on line 2761
[23-May-2022 14:29:19 UTC] PHP Deprecated:  rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in /web/test.twoj-host.eu/public_html/wp-includes/formatting.php on line 2761