Hello Daniel,
My apologies for the late reply.
This is the link I get from errors.ubuntu.com for this issue:
https://errors.ubuntu.com/oops/a46fb0ae-d608-11e8-9484-fa163ee63de6
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Public bug reported:
gnome-shell crashes with signal 11 (segmentation fault) when I try to
lock the screen while a widget in the dock is in focus. The end result
is that the screen either does not lock, and gnome-shell reloads, or it
hangs (can move mouse, but mouse clicks or keyboard presses don
