openttd: /home/dp/Projects/OpenTTD/src/viewport.cpp:1974: void SetSelectionTilesDirty(): Assertion `x_size >= 0' failed.

Thread 1 "openttd" received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50  ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7274859 in __GI_abort () at abort.c:79
#2  0x00007ffff7274729 in __assert_fail_base (fmt=0x7ffff740a588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x5555566a874a "x_size >= 0", 
    file=0x5555566a7c08 "/home/dp/Projects/OpenTTD/src/viewport.cpp", line=1974, function=<optimized out>) at assert.c:92
#3  0x00007ffff7285f36 in __GI___assert_fail (assertion=0x5555566a874a "x_size >= 0", file=0x5555566a7c08 "/home/dp/Projects/OpenTTD/src/viewport.cpp", line=1974, 
    function=0x5555566a872c "void SetSelectionTilesDirty()") at assert.c:101
#4  0x0000555556061216 in SetSelectionTilesDirty () at /home/dp/Projects/OpenTTD/src/viewport.cpp:1974
#5  0x000055555606305f in UpdateTileSelection () at /home/dp/Projects/OpenTTD/src/viewport.cpp:2582
#6  0x000055555608b386 in MouseLoop (click=MC_NONE, mousewheel=0) at /home/dp/Projects/OpenTTD/src/window.cpp:2883
#7  0x000055555608bafd in HandleMouseEvents () at /home/dp/Projects/OpenTTD/src/window.cpp:3050
#8  0x0000555555cb3e07 in VideoDriver_SDL::PollEvent (this=0x5555583f3560) at /home/dp/Projects/OpenTTD/src/video/sdl2_v.cpp:511
#9  0x0000555555cb44f8 in VideoDriver_SDL::MainLoop (this=0x5555583f3560) at /home/dp/Projects/OpenTTD/src/video/sdl2_v.cpp:714
#10 0x0000555555ec2edd in openttd_main (argc=1, argv=0x7fffffffdda8) at /home/dp/Projects/OpenTTD/src/openttd.cpp:844
#11 0x0000555555bcf4d6 in main (argc=1, argv=0x7fffffffdda8) at /home/dp/Projects/OpenTTD/src/os/unix/unix.cpp:261
(gdb) frame 4
#4  0x0000555556061216 in SetSelectionTilesDirty () at /home/dp/Projects/OpenTTD/src/viewport.cpp:1974
1974            assert(x_size >= 0);
(gdb) l
1969            }
1970    
1971            x_size -= TILE_SIZE;
1972            y_size -= TILE_SIZE;
1973    
1974            assert(x_size >= 0);
1975            assert(y_size >= 0);
1976    
1977            int x_end = Clamp(x_start + x_size, 0, MapSizeX() * TILE_SIZE - TILE_SIZE);
1978            int y_end = Clamp(y_start + y_size, 0, MapSizeY() * TILE_SIZE - TILE_SIZE);
(gdb) p x_size
$1 = -16
(gdb) p y_size
$2 = -16
(gdb) p _thd
$3 = {pos = {x = 512, y = 784}, size = {x = 0, y = 0}, offs = {x = 0, y = 0}, outersize = {x = 0, y = 0}, diagonal = false, freeze = false, new_pos = {x = 512, y = 784}, new_size = {x = 0, y = 0}, 
  new_outersize = {x = 0, y = 0}, dirty = 255 '\377', selstart = {x = 0, y = 0}, selend = {x = 0, y = 0}, sizelimit = 0 '\000', drawstyle = HT_RECT, next_drawstyle = HT_NONE, place_mode = HT_RECT, 
  window_class = WC_BUILD_OBJECT, window_number = 0, make_square_red = false, redsq = 4294967295, select_method = VPM_X_OR_Y, select_proc = DDSP_DEMOLISH_AREA}