Normal view category have error 0 - Attempt to modify property "params" on null
Url to check https://nowygabinet.nyj.pl/index.php/spis-tresci-ngs
Mayby this is last error where I found.
I updated this file on your site: /templates/ja_teline_v/html/com_content/category/default_articles.php
We will update this on next release of template also.
Ok. This is good info.