Having the same issue. Never had problems with Pretty Link before but since the new update it has crashed our site and thrown gigs worth of errors in the logs, same messages as above. Have had to roll back to 2.1.8 since that’s the last backup we have that includes the pro folder.
Note: disabling the plugin and rolling it back didn’t immediately fix the problem or stop whatever processes were causing the error. It continued for another 20 minutes even after uninstalling 3.0 and reinstalling 2.1.8