Problems with getSiteSearchKeywords after update to 3.13.1

Support & Bugs
1

After the update I get the following error messages:

WARNING: /www/htdocs/<my domain>/plugins/CoreVisualizations/Visualizations/HtmlTable.php(228): Notice - Undefined index: nb_pages_per_search - Matomo 3.13.1 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already) (Module: Actions, Action: getSiteSearchKeywords, In CLI mode: false)

WARNING: /www/htdocs/<my domain>/core/DataTable/Row.php(188): Warning - Illegal offset type - Matomo 3.13.1 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already) (Module: Actions, Action: getSiteSearchKeywords, In CLI mode: false)

What can I do about it?
Thanks a lot

2

I did a little trial and error. When I disable the “Site Search Keywords” widget on the dashboard, the error message does not appear. When I turn it on again, the message appears again.