A similar to the below warning appears on attempt to create a backup:
Warning: mysql "wordpress_db" @ESCAPE_VALUE_BEGIN@Unable to execute SQL: Table 'wordpress_db.qwerty_wfVulnScanners' doesn't exist in engine. SQL query: SHOW FULL COLUMNS IN qwerty_wfVulnScanners@ESCAPE_VALUE_END@
Inconsistency in tables of Wordfence Security plugin.
Contact Wordfence Security plugin developers.
As a workaround, remove the Wordfence Security plugin from WordPress instance.
If the issue still persist, delete the remained tables:
In Plesk go to Domain > example.com > Databases and click phpMyAdmin.
In phpMyAdmin select the table from the error message > click the Operations tab > Delete the table (Drop) > OK.