Hello,
Sorry for any inconvenience that might have been caused due to that.
It seems like new tables are not getting created in the Database or some old plugin has left an incorrect entry.
1. Please follow these steps to fix the issue:
https://rankmath.com/kb/fatal-error-after-1-0-49-update/
2. Please follow only the first 2 steps and clear your caches. The following steps mentioned in the article are for advanced users.
Here’s a video screencast:
https://i.rankmath.com/KStFug
Please clear all the cache, including the server after following the above process and that should resolve the issue.
Hope that helps. Thank you and please don’t hesitate to let us know if you need our assistance with anything else.