Undefined array key "contributor"

[SKruch]

Describe the bug
Got error 'PHP message: PHP Warning: Undefined array key "contributor" in /var/www/dokuwiki/lib/plugins/pagequery/PageQuery.php on line 197',

To Reproduce
Steps to reproduce the behaviour: {{pagequery>.*;filter=contributor:User Name}}
TypeError: implode(): If argument mprins#1 ($separator) is of type string, argument mprins#2 ($array) must be of type array, null given
An unforeseen error has occured. This is most likely a bug somewhere. It might be a problem in the pagequery plugin.
More info has been written to the DokuWiki error log.
Got error 'PHP message: PHP Warning: Undefined array key "contributor" in /var/www/dokuwiki/lib/plugins/pagequery/PageQuery.php on line 197',

Desktop
PHP 8.4.20:
dokuwiki version: DokuWiki version: Release 2025-05-14b "Librarian"
Browser chrome Version 148.0.7778.179

[MrBertie]

Better to post your issue here: https://github.com/mprins/pagequery
I no longer maintain this plugin.