Program received signal SIGSEGV, Segmentation fault.
find_toplevel_surface (in_surface=<optimized out>) at ../desktop-shell/shell.c:491
491                     surface = get_shell_surface(surface->parent);
(gdb) bt full
#0  find_toplevel_surface (in_surface=<optimized out>) at ../desktop-shell/shell.c:491
        surface = <optimized out>
#1  surface_move (shsurf=0x14afe90, pointer=0x137b9d0, client_initiated=false) at ../desktop-shell/shell.c:1701
        move = <optimized out>
#2  0x000000000041a8dd in weston_compositor_run_button_binding (compositor=compositor@entry=0x1221f60, pointer=pointer@entry=0x137b9d0, time=time@entry=28825409,
    button=button@entry=272, state=state@entry=WL_POINTER_BUTTON_STATE_PRESSED) at ../src/bindings.c:367
        handler = <optimized out>
        b = <optimized out>
        tmp = 0x13cfd00
#3  0x00000000004143f2 in notify_button (seat=<optimized out>, time=28825409, button=button@entry=272, state=state@entry=WL_POINTER_BUTTON_STATE_PRESSED)
    at ../src/input.c:1258
        compositor = 0x1221f60
#4  0x00007f811fc4b8c6 in handle_pointer_button (pointer_event=<optimized out>, libinput_device=<optimized out>) at ../src/libinput-device.c:150
        device = 0x13c47d0
        button_state = <optimized out>
        seat_button_count = <optimized out>
#5  evdev_device_process_event (event=event@entry=0x148b980) at ../src/libinput-device.c:313
        libinput_device = <optimized out>
        handled = 1
#6  0x00007f811fc4aee4 in process_event (event=0x148b980) at ../src/libinput-seat.c:169
No locals.
#7  process_events (input=0x122aa98) at ../src/libinput-seat.c:179
        event = 0x148b980
#8  0x00007f811fc4b1c6 in udev_input_dispatch (input=0x122aa98) at ../src/libinput-seat.c:190
No locals.
#9  libinput_source_dispatch (fd=<optimized out>, mask=<optimized out>, data=0x122aa98) at ../src/libinput-seat.c:200
        input = 0x122aa98
#10 0x00007f812165f4f2 in wl_event_loop_dispatch (loop=0x121f200, timeout=timeout@entry=-1) at src/event-loop.c:421
#11 0x00007f812165dbd5 in wl_display_run (display=display@entry=0x121f170) at src/wayland-server.c:1011
#12 0x0000000000409063 in main (argc=1, argv=<optimized out>) at ../src/main.c:859