This fixed it for me:
bench reload-doc desk doctype event_participants
No more errors in the Error Log after 3 hours. Also, this is on v12 upgraded from v10 using the advice here: (Resolved) Restore V12 from V10 backups - #5 by crafter
This fixed it for me:
bench reload-doc desk doctype event_participants
No more errors in the Error Log after 3 hours. Also, this is on v12 upgraded from v10 using the advice here: (Resolved) Restore V12 from V10 backups - #5 by crafter