Default font changes break 4chanX

[usernamestring]

4chan X breaks in threads if mods change the default font in posts. The following message is displayed multiple times:

Parsing of Post No.X failed. Post will be skipped. TypeError: fileText.childNodes[2] is undefined

Example: https://boards.4chan.org/s4s/thread/2275348

The main problem is that posts with images can't be quoted and they don't display the quick reply dialog when clicking on their post number.