PHP Warning Caused by Pro Sites

I installed the Pro Sites plugin this week and I’ve been getting the following PHP Warning in my error logs ever since:

PHP Warning: Missing argument 2 for sync_category_tag_slugs() in /nas/content/live/noyearslost/wp-admin/includes/ms.php on line 647

It seems to only be coming from a specific subdomain which is also a BuddyPress install

I wondered if anyone has insight into this generally, and or, if it’s unique to me, and would then be able to help me narrow down the issue.

Thank you.