Unable to regenerate certificate - date() error.

[thepurpleblob]

Exception - date(): Argument #2 ($timestamp) must be of type ?int, string given

[More information about this error](https://docs.moodle.org/404/en/error/moodle/generalexceptionmessage)

Debug info:
Error code: generalexceptionmessage×Dismiss this notification
Stack trace:
line 63 of /auth/saml2/regenerate.php: TypeError thrown
line 63 of /auth/saml2/regenerate.php: call to date()

Seems to be true the second parameter is a str_replace which returns a string not an int. Casting the str_replace with (int) seems to sort it.