'Undefined Offset' in Comments

Yesterday an update to SuperCache totally borked my site, giving me the dreaded White Screen of Death.

After a few hours of tinkering I was able to restore the majority of the site’s functionality, but there are still a few remaining error messages that pop up in a few spaces.

One of the more noticeable ones is an “undefined offset” error that’s displaying alongside every single comment on the site now. (See an example on this recent post).

Does anyone know how to fix this – or just to get it to stop displaying? I’m a fairly beginner-moderate user of WordPress (don’t know much code, but know how to get into it to make copy-and-paste changes and stuff like that). ANY help would be tremendously appreciated.

Thanks!