Great, thanks for this.
Can you reproduce this repeatedly? If so, you've also a /var/crash file for this?

at least now we know where it crashes :)

spal. 22 17:57:57 grr gnome-shell[20099]: Object Shell.GenericContainer (0x563876a896d0), has been already deallocated — impossible to get any property from it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
spal. 22 17:57:57 grr gnome-shell[20099]: Object Shell.GenericContainer (0x563876a896d0), has been already deallocated — impossible to access it. This might be caused by the object having been destroyed from C code using something such as destroy(), dispose(), or remove() vfuncs.
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: == Stack trace for context 0x5638745012a0 ==
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #0   56387a1040b0 i   resource:///org/gnome/shell/ui/boxpointer.js:234 (7fc34a71a940 @ 574)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #1   7fff5ce00020 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (7fc34aab0b80 @ 71)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #2   7fff5ce00100 b   self-hosted:981 (7fc34aaf01f0 @ 474)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #3   7fff5ce01b80 b   resource:///org/gnome/shell/ui/layout.js:211 (7fc34a701790 @ 62)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: == Stack trace for context 0x5638745012a0 ==
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #0   56387a104170 i   resource:///org/gnome/shell/ui/boxpointer.js:448 (7fc34a71ab80 @ 179)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #1   7fff5cdff090 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (7fc34aab0b80 @ 71)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #2   56387a1040b0 i   resource:///org/gnome/shell/ui/boxpointer.js:235 (7fc34a71a940 @ 597)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #3   7fff5ce00020 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (7fc34aab0b80 @ 71)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #4   7fff5ce00100 b   self-hosted:981 (7fc34aaf01f0 @ 474)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #5   7fff5ce01b80 b   resource:///org/gnome/shell/ui/layout.js:211 (7fc34a701790 @ 62)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: GNOME Shell crashed with signal 11
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: == Stack trace for context 0x5638745012a0 ==
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #0   56387a104170 i   resource:///org/gnome/shell/ui/boxpointer.js:448 (7fc34a71ab80 @ 179)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #1   7fff5cdff090 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (7fc34aab0b80 @ 71)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #2   56387a1040b0 i   resource:///org/gnome/shell/ui/boxpointer.js:235 (7fc34a71a940 @ 597)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #3   7fff5ce00020 b   resource:///org/gnome/gjs/modules/_legacy.js:82 (7fc34aab0b80 @ 71)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #4   7fff5ce00100 b   self-hosted:981 (7fc34aaf01f0 @ 474)
spal. 22 17:57:57 grr org.gnome.Shell.desktop[20099]: #5   7fff5ce01b80 b   resource:///org/gnome/shell/ui/layout.js:211 (7fc34a701790 @ 62)