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crash when alt-tabbing

on OpenBSD, using 4.18.0, xfwm crashes sometimes when alt-tabbing, and the backtrace points at https://gitlab.xfce.org/xfce/xfwm4/-/blob/master/src/tabwin.c#L998, so maybe a null deref ?

(gdb) core xfwm4.core 
[New process 441345]
[New process 573830]
[New process 416271]
[New process 393628]
Core was generated by `xfwm4'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  tabwinRemoveClient (tabwin=0xea976b5db40, c=0xea9acf58700) at tabwin.c:998
998	tabwin.c: No such file or directory.
[Current thread is 1 (process 441345)]
(gdb) bt
#0  tabwinRemoveClient (tabwin=0xea976b5db40, c=0xea9acf58700) at tabwin.c:998
#1  0x00000ea71d9d1322 in clientCycleEventFilter (event=0xea971291840, data=0x73655dd23db0) at cycle.c:429
#2  0x00000ea71d9d3ce6 in eventXfwmFilter (gdk_xevent=<optimized out>, gevent=<optimized out>, data=<optimized out>) at event_filter.c:175
#3  0x00000ea9de9e05df in _gdk_x11_display_queue_events () from /usr/local/lib/libgdk-3.so.2201.1
#4  0x00000ea9de980d08 in gdk_display_get_event () from /usr/local/lib/libgdk-3.so.2201.1
#5  0x00000ea9de9e0c78 in gdk_event_source_dispatch () from /usr/local/lib/libgdk-3.so.2201.1
#6  0x00000eaa10e0020d in g_main_context_dispatch_unlocked () from /usr/local/lib/libglib-2.0.so.4201.11
#7  0x00000eaa10e005ec in g_main_context_iterate_unlocked () from /usr/local/lib/libglib-2.0.so.4201.11
#8  0x00000eaa10e009fa in g_main_loop_run () from /usr/local/lib/libglib-2.0.so.4201.11
#9  0x00000ea920da74bb in gtk_main () from /usr/local/lib/libgtk-3.so.2201.0
#10 0x00000ea71d9d0f79 in clientCycle (c=<optimized out>, event=0xea971278420) at cycle.c:536
#11 0x00000ea71d9d4719 in handleKeyPress (display_info=0xea9e8833a00, event=0xea971278420) at events.c:329
#12 handleEvent (display_info=0xea9e8833a00, event=0xea971278420) at events.c:2181
#13 xfwm4_event_filter (event=0xea971278420, data=0xea9e8833a00) at events.c:2302
#14 0x00000ea71d9d3ce6 in eventXfwmFilter (gdk_xevent=<optimized out>, gevent=<optimized out>, data=<optimized out>) at event_filter.c:175
#15 0x00000ea9de9e05df in _gdk_x11_display_queue_events () from /usr/local/lib/libgdk-3.so.2201.1
#16 0x00000ea9de980d08 in gdk_display_get_event () from /usr/local/lib/libgdk-3.so.2201.1
#17 0x00000ea9de9e0c78 in gdk_event_source_dispatch () from /usr/local/lib/libgdk-3.so.2201.1
#18 0x00000eaa10e0020d in g_main_context_dispatch_unlocked () from /usr/local/lib/libglib-2.0.so.4201.11
#19 0x00000eaa10e005ec in g_main_context_iterate_unlocked () from /usr/local/lib/libglib-2.0.so.4201.11
#20 0x00000eaa10e009fa in g_main_loop_run () from /usr/local/lib/libglib-2.0.so.4201.11
#21 0x00000ea920da74bb in gtk_main () from /usr/local/lib/libgtk-3.so.2201.0
#22 0x00000ea71d9e3495 in main (argc=1, argv=0x73655dd24758) at main.c:764