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After PHP upgrade to 8.x, in the browser at background some lines of code appear, like these below:

[phpBB Debug] PHP Warning: in file [ROOT]/ext/spaceace/ajaxchat/event/listener.php on line 467: Trying to access array offset on value of type bool
[phpBB Debug] PHP Warning: in file [ROOT]/ext/spaceace/ajaxchat/event/listener.php on line 471: Trying to access array offset on value of type bool
[phpBB Debug] PHP Warning: in file [ROOT]/ext/spaceace/ajaxchat/event/listener.php on line 475: Trying to access array offset on value of type bool
[phpBB Debug] PHP Warning: in file [ROOT]/ext/spaceace/ajaxchat/event/listener.php on line 484: Trying to access array offset on value of type bool
[phpBB Debug] PHP Warning: in file [ROOT]/ext/spaceace/ajaxchat/event/listener.php on line 818: Trying to access array offset on value of type bool

Where as ...

at line 467:
if ($this->get_status($row['user_lastpost']) === 'online')
at line 471:
else if ($this->get_status($row['user_lastpost']) === 'idle')
at line 475:
else if ($this->user->data['user_id'] === ANONYMOUS || $this->get_status($row['user_lastpost']) === 'offline')
at line 484:
if ($this->user->data['user_id'] === ANONYMOUS || $row['user_lastpost'] === null)
at line 818:
return (bool) $hidden['session_viewonline'];

Does it mean there's no support for PHP 8.x or is there anything else I can do to solve this?