Repeated errors in cgi_error_log – cannot find name for group ID

Am taking these errors about once a second. I have contacted my web hosting company and they said its a plugin/settings issue:

admin-ajax.php groups: cannot find name for group ID 15020

Any ideas? Am not convinced there’s a problem with the plugin but just thought I would ask first.

Thanks, –Alex

https://ww.wp.xz.cn/plugins/backupwordpress/