Cymunk crash at shutdown

shutdownbacktrace

#0  0x00007ffff7826267 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:55
#1  0x00007ffff7827eca in __GI_abort () at abort.c:89
#2  0x00007ffff7869c53 in __libc_message (do_abort=do_abort@entry=1, 
    fmt=fmt@entry=0x7ffff79821a8 "*** Error in `%s': %s: 0x%s ***\n")
    at ../sysdeps/posix/libc_fatal.c:175
#3  0x00007ffff7871c69 in malloc_printerr (ptr=<optimized out>, 
    str=0x7ffff797e2fa "free(): invalid pointer", action=1) at malloc.c:4965
#4  _int_free (av=<optimized out>, p=<optimized out>, have_lock=0) at malloc.c:3834
#5  0x00007ffff787589c in __GI___libc_free (mem=<optimized out>) at malloc.c:2950
#6  0x00007fffe96e9c95 in __pyx_pf_6cymunk_6cymunk_4Body_2__dealloc__ (__pyx_v_self=<optimized out>, 
    __pyx_v_self=<optimized out>) at cymunk/cymunk.c:22259
#7  __pyx_pw_6cymunk_6cymunk_4Body_3__dealloc__ (__pyx_v_self=0x7fffe7921c80) at cymunk/cymunk.c:22231
#8  __pyx_tp_dealloc_6cymunk_6cymunk_Body (o=0x7fffe7921c80) at cymunk/cymunk.c:41229
#9  0x00007fffe96eb9b5 in __pyx_pf_6cymunk_6cymunk_5Space_2__dealloc__ (__pyx_v_self=<optimized out>, 
    __pyx_v_self=<optimized out>) at cymunk/cymunk.c:33185
#10 __pyx_pw_6cymunk_6cymunk_5Space_3__dealloc__ (__pyx_v_self=0x7fffe8433f30) at cymunk/cymunk.c:33165
#11 __pyx_tp_dealloc_6cymunk_6cymunk_Space (o=0x7fffe8433f30) at cymunk/cymunk.c:42215
#12 0x00000000004bb663 in ?? ()
#13 0x00000000004a946e in ?? ()
#14 0x0000000000519270 in PyGC_Collect ()
#15 0x00000000005173ff in Py_Finalize ()
#16 0x000000000049a93a in Py_Main ()
#17 0x00007ffff7811a40 in __libc_start_main (main=0x49a500 <main>, argc=2, argv=0x7fffffffddb8, 
    init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdda8)
    at libc-start.c:289
#18 0x000000000049a429 in _start ()