The message in the thread title appears when saving profile updates (in that case canvas picture and avatar)
The updates are applied, despite the error message. I can only guess which field is affected, as there is no "gender" field. We have a field "cb_geschlecht", which is text and shows values like männlich or weiblich (male or female). Users can set their cb_geschlecht from a drop-down, after registration - so this information is not available for everyone
Our joomla version is 4.3.1
CB is on version 2.8.0+build.2023.03.17.19.11.55.64386eb8d
PHP Version 8.0.24
mysql Ver 14.14 Distrib 5.7.42, for Linux (x86_64) using EditLine wrapper