ACP Error since PHP 8.1

[miri4ever]

If I add a user to a special groups and decide to put him right away as main group I am getting this warning message from MChat Rooms:

Code: Select all

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[kasimi]

Hi miri, are you talking about the page in ACP, Users & Groups, Manage groups, Members? If so, I just tested it and I didn't get any warning. Can you confirm this is still happening and let me know how to reproduce it?