Yes, this is probably because only one session supports GL hardware
acceleration at a time, and that probably triggers a bug somewhere
inside the -nvidia driver.

** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
   Importance: Undecided => High

** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
       Status: Confirmed => Triaged

-- 
glxinfo crashed with SIGSEGV while switch back from guest user.
https://bugs.launchpad.net/bugs/353908
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