As shown above, generally, it comes from fonts. I opened the edge folder then aFilename_edge.js
3 posts are useful:
1) post #8: wrong formed fonts.
2) post #5: repaired fonts.
3) Because generally is not 100%, so see post #16.
Yes, I have them
I've looked to the code and didn't find the error. (The generated js is a bit populated for me ...).
But what is really obvious is that it happens really often.