with Debug turned on

In the dashboard, under recent comments, I am getting this error, multiple times, just different Line reference #s. anyone know why?

Notice: Trying to get property of non-object in /xxx/xxx/xxx/xxx/xxxxx/domains/domain.org/html/xxx/wp-includes/capabilities.php on line 1065

Considering other issues with this site, would anyone think this could be a database issue?

Thanks for any help you can provide…