This looks like the problem, assuming the right section of the system
log is attached in comment #1:
[36178.231698] Dapple gnome-shell[3998]: == Stack trace for context
0x5562d03ed170 ==
[36178.231698] Dapple gnome-shell[3998]: #0 5562ed968248 i
resource:///org/gnome/shell/ui/windowManager.js:1542 (339f27529c90 @ 23)
[36178.231698] Dapple gnome-shell[3998]: #1 7ffd1afab520 b self-hosted:1181
(3ed1fbfb0a10 @ 454)
[36178.231698] Dapple gnome-shell[3998]: #2 5562ed9681c8 i
resource:///org/gnome/shell/ui/main.js:260 (3ed1fbfef150 @ 12)
[36178.231698] Dapple gnome-shell[3998]: GNOME Shell crashed with signal 11
[36178.231698] Dapple gnome-shell[3998]: == Stack trace for context
0x5562d03ed170 ==
[36178.231698] Dapple gnome-shell[3998]: #0 5562ed9681c8 i
resource:///org/gnome/shell/ui/main.js:260 (3ed1fbfef150 @ 12)
[36178.232108] Dapple gnome-shell[3998]: JS ERROR: TypeError: window is null
_destroyWindow@resource:///org/gnome/shell/ui/windowManager.js:1543:9
_initializeUI/<@resource:///org/gnome/shell/ui/main.js:260:16
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https://bugs.launchpad.net/bugs/1969266
Title:
application windows frozen after screen blanking
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