Has anyone seen this in a php log, v8.5.12 site, php7.4?
No corresponding info in the concrete Log. I have a site generating a cluster of these every few days.
PHP Fatal error: Uncaught Exception: Serialization of 'Closure' is not allowed in [no active file]:0
#0 [internal function]: session_write_close()
thrown in [no active file] on line 0