3D FlipBook - e.at is not a function. (In 'e.at(-1)', 'e.at' is undefined)

I get this message (in safari only, i only see "Please wait! The book is processing..." in Chrome)

"Setting up fake worker failed: "e.at is not a function. (In 'e.at(-1)', 'e.at' is undefined)". See the debugging console for details (Ctrl+Shift+I in Chrome)."

Ctrl+Shift+I in Chrome does not open anything.

And when i do look at my code, e.at is not even in the code anywhere.

Also, I didn't change any code and we have used this plugin for 2+ years with no problem.