@scottalanmiller said:
That's a weird one.
Truly.
The weirdness is in fact the error comes randomly O_o
Steps to reproduce: continue pressing a "Page Reload Button" (Ctrl + R?), one per 10-20 attempts you'll catch the error. No matter what page you are on, even ACP.
And not only the one error, some others too
https://a.pomf.se/pidgjn.png