Pop Up Pro Uncaught TypeError: Cannot read property 'top' of undefined

I am getting this error in the Chrome Console:

Uncaught TypeError: Cannot read property 'top' of undefined
at e.show_at_element (80254c5….js:14)
at dispatch (5cb2415….js:3)
at m.handle (5cb2415….js:3)
e.show_at_element @ 80254c5….js:14
dispatch @ 5cb2415….js:3
m.handle @ 5cb2415….js:3

It shows up when I have Hummingbird Minify on, I've tried:
1. Changing minification settings one file at a time to troubleshoot
2. toggling "smoothscroll" settings
3. toggling ad-blocker
4. deactivating pop-up pro (only thing that makes the error go away)
5. moving popup-pro js file to header <> footer
6. moving jquery files to header <>footer

I am starting to think I have a bug on my hands, but I am open to other suggestions.