Hi all.
Will everything is ok with your plugin if we change the line classes/PDb_Session.php:190?
from
if ( session_status() !== PHP_SESSION_ACTIVE ) {
to
if ( session_status() !== PHP_SESSION_ACTIVE && session_status() !== PHP_SESSION_NONE ) {
With that change, Bookly works ok. I’m able to see that when Bookly is enabled then session_status() returns 1, but you checking is session_status() returns 1 or 0 and trying to create a session again.
Please let me know if I’m correct and it is helpful.