Reading that, I realized of course the SM plugin is not active on most of the subsites, only on the main subsite.axew3 wrote: Fri Jul 24, 2026 9:16 pm Except if the SM plugin is not active or some other code prevent the SM execution somehow...
So testing code changes again:
if user logs in from phpBB and goes to WP subsites where SM plugin is not enabled, the critical error (as above) occurs and the user is logged out of phpBB and WP.
if user logs in from phpBB and goes to WP subsite where SM plugin is enabled, no critical error occurs, but user is logged out of phpBB and WP.
if user logs in from WP subsite where SM plugin is enabled, there are no problems. User stays logged into their WP Simple Membership account, WP and phpBB.

