PHP Warning: session_id(): Cannot change session id when session is active
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Description

When trying out php7.3 on mediawiki 1.32 im getting:

/wiki/   ErrorException from line 879 of /srv/mediawiki/w/includes/Setup.php: PHP Warning: session_id(): Cannot change session id when session is active
#0 [internal function]: MWExceptionHandler::handleError(integer, string, string, integer, array)
#1 /srv/mediawiki/w/includes/Setup.php(879): session_id(string)
#2 /srv/mediawiki/w/includes/WebStart.php(77): require_once(string)
#3 /srv/mediawiki/w/index.php(39): require(string)
#4 {main}
Paladox created this task.Fri, Jan 11, 10:00 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFri, Jan 11, 10:00 PM

I concur with this. I've had this same error on my browser with PHP 7.3