#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
  [Error: raise.c was not found in source tree]
#1  0x00007fa8379bb899 in __GI_abort () at abort.c:79
  [Error: abort.c was not found in source tree]
#2  0x00007fa838753b43 in g_assertion_message.cold () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa8387b0a6f in g_assertion_message_expr () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa837c4fb78 in meta_window_unmanage (window=0x5572f5bb6e80, timestamp=867760) at ../src/core/window.c:1591
  [Error: window.c was not found in source tree]
#5  0x00007fa837c5cf81 in handle_other_xevent (x11_display=x11_display@entry=0x5572f3921360, event=event@entry=0x7ffca6e1e300) at ../src/x11/events.c:1374
  [Error: events.c was not found in source tree]
#6  0x00007fa837c5db3b in meta_x11_display_handle_xevent (event=0x7ffca6e1e300, x11_display=0x5572f3921360) at ../src/x11/events.c:1857
  [Error: events.c was not found in source tree]
#7  xevent_filter (xevent=0x7ffca6e1e300, event=<optimized out>, data=0x5572f3921360) at ../src/x11/events.c:1899
  [Error: events.c was not found in source tree]
#8  0x00007fa8378a1f6f in gdk_event_apply_filters () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#9  0x00007fa8378a229b in _gdk_x11_display_queue_events () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#10 0x00007fa83786a094 in gdk_display_get_event () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#11 0x00007fa8378a2006 in gdk_event_source_dispatch () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#12 0x00007fa838787ecd in g_main_context_dispatch () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007fa838788150 in g_main_context_iterate.isra () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007fa838788443 in g_main_loop_run () from /tmp/apport_sandbox_wlmufkt0/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007fa837c3a390 in meta_run () at ../src/core/main.c:676
#16 0x00005572f2620d85 in main ()