Missing div tag bumping sidebar to bottom

Hello,

I’m having issues with my sidebar on posts. The sidebar is getting bumped below the post. After messing with the page source I can confirm that all it needs is a missing </div> tag. Problem is, that I don’t know what file I need to go into and where in it that I need to close the tag.

This is an example of the site

This is from inspect element

It seems I need another </div> somewhere above “span4.” Any help would be greatly appreciated!