I have installed the IPtoCompany plugin and get these two warnings:
WARNING: Sorting the API method "Live.getLastVisitDetails" by column is currently not supported. To avoid this warning remove the URL parameter "filter_sort_column" from your API request. (Module: API, Action: getCompanies, Method: Live.getLastVisitsDetails, In CLI mode: false) WARNING: /piwik/plugins/IPtoCompany/API.php(53): Warning - gethostbyaddr(): Address is not a valid IPv4 or IPv6 address - Matomo 3.13.1-b2 - 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: IPtoCompany, Action: getCompanies, Method: IPtoCompany.getCompanies, In CLI mode: false)
This is a third party plugin. Maybe try opening an issue here: https://github.com/Romain/Matomo-IP-to-Company
Ahh, ok, thank you. Reported it there. Have installed it from the marketplace and thought it was an official plugin, because of the hint "Please report this message in the Matomo forums". Sorry for that.