Comment 30 for bug 1766137

Sum Sim

Not sure it is the Nvidia driver, I have had the same problem on both the Nvidia-390 and the X-org Nouveau display driver.
There seems to be a lot of talk about error occurring with incorrect password input, this is inconsistent with my experience.
The best workaround I have seen so far is mentioned by Wayne Carr (above), rather than log-out when switching users, use the switch-user option. This obviously leaves all profiles active but the fault does not occur.