Darktable: Apply mask segfault

Program received signal SIGSEGV, Segmentation fault.
dt_curve_get_distance (x=<optimized out>, y=147, as=as@entry=0.835131288,
    gui=gui@entry=0xd93e30, index=index@entry=0, corner_count=5,
    inside=inside@entry=0x7fffffffd720,
    inside_border=inside_border@entry=0x7fffffffd730,
    near=near@entry=0x7fffffffd740)
    at /home/polarfox/Build/darktable/src/develop/masks/curve.c:395
395   for (int i=corner_count*3; i<gpt->border_count; i++)
(gdb) bt
#0  dt_curve_get_distance (x=<optimized out>, y=147, as=as@entry=0.835131288,
    gui=gui@entry=0xd93e30, index=index@entry=0, corner_count=5,
    inside=inside@entry=0x7fffffffd720,
    inside_border=inside_border@entry=0x7fffffffd730,
    near=near@entry=0x7fffffffd740)
    at /home/polarfox/Build/darktable/src/develop/masks/curve.c:395
#1  0x00007ffff7a721d4 in dt_group_events_mouse_moved (
    module=module@entry=0xd2daa0, pzx=0.507675231, pzy=0.228800505,
    which=which@entry=0, form=form@entry=0x1265000, gui=gui@entry=0xd93e30)
    at /home/polarfox/Build/darktable/src/develop/masks/group.c:122
#2  0x00007ffff7a736f1 in dt_masks_events_mouse_moved (module=0xd2daa0,
    x=x@entry=709, y=y@entry=506, which=which@entry=0)
    at /home/polarfox/Build/darktable/src/develop/masks/masks.c:450
#3  0x00007fffbc5b12a7 in mouse_moved (self=0x961990, x=709, y=506, which=0)
    at /home/polarfox/Build/darktable/src/views/darkroom.c:1176
#4  0x00007ffff7a86f0d in mouse_moved (w=<optimized out>, event=0xbfcee0,
    user_data=<optimized out>)
    at /home/polarfox/Build/darktable/src/gui/gtk.c:689
#5  0x00007ffff66aa599 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#6  0x00007ffff6e70140 in g_closure_invoke ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x00007ffff6e81550 in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007ffff6e890cb in g_signal_emit_valist ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00007ffff6e89642 in g_signal_emit ()
   from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x00007ffff67c395e in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#11 0x00007ffff66a8934 in gtk_propagate_event ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#12 0x00007ffff66a8c8b in gtk_main_do_event ()
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#13 0x00007ffff6c08d7c in ?? ()
   from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#14 0x00007ffff70f6ab5 in g_main_context_dispatch ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007ffff70f6de8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007ffff70f71e2 in g_main_loop_run ()
   from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#17 0x00007ffff66a7c77 in gtk_main ()
---Type <return> to continue, or q <return> to quit---
   from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#18 0x00007ffff7a88af5 in dt_gui_gtk_run (gui=<optimized out>)
    at /home/polarfox/Build/darktable/src/gui/gtk.c:984
#19 0x00000000004007b8 in main (argc=<optimized out>, argv=<optimized out>)
    at /home/polarfox/Build/darktable/src/main.c:25