Your add-on adds extra data, such as a forum list, to the admin user criteria page and you receive an error in Advanced Forms
Most likely you've done this with a templater_macro_pre_render code event listener for the XenForo user_pane macro. If that's the case, you need to create a new code event listener in your add-on with this information:
Listen to event: templater_macro_pre_render
Event hint: admin:helper_criteria:Snog_user_page
Execute callback: The same callback used for XF itself
Execution order: 10