Server error for x-ray thread only.

When logged in and trying to view the x-ray thread, I get a server error. Either the White Screen of Death (WSoD) or a browser notice (see attachment). I've tried clearing cookies, switching browsers, and switching devices. Pretty sure there's something going on at the other end. Possibly related to the size of the thread; it may be exceeding some PHP configuration limits.

It happens only on this particular thread.

Attachment 195292

FWIW, it works fine for me, on Google Chrome.

Works fine on iPad Pro and Safari

The thread displays properly for me on Win10/Firefox 69.0, as well as on my iPhone with Firefox.