FYI: from a core dump - top of where is:

Segmentation fault in winsnstr at 0xd3ebc050
0xd3ebc050 (winsnstr+0x190) a4190002           lhzu   r0,0x2(r25)
(dbx) where
winsnstr(??, ??, ??) at 0xd3ebc050
unnamed block in IPRA.$_curses_window_insstr_impl(self = 0x100fd954, group_left_1 = -739652824, y = 804382672, x = 804382676, str = 0x2ff1e7dc, group_right_1 = -739620304, attr = 0), line 1855 in "_cursesmodule.c"
IPRA.$_curses_window_insstr_impl(self = 0x100fd954, group_left_1 = -739652824, y = 804382672, x = 804382676, str = 0x2ff1e7dc, group_right_1 = -739620304, attr = 0), line 1855 in "_cursesmodule.c"
_curses_window_insstr(self = 0x100a96ec, args = 0x20088288), line 1160 in "_cursesmodule.c.h"
cfunction_call(func = 0x305337d0, args = 0x20088288, kwargs = 0x2ff1e8b0), line 567 in "methodobject.c"
_PyObject_MakeTpCall(tstate = (nil), callable = 0x20088288, args = 0x2ff1e930, nargs = 131, keywords = 0x10167b48), line 215 in "call.c"
_PyEval_EvalFrameDefault(tstate = 0x100b2a6c, f = 0x303a1268, throwflag = 806335952), line 1429 in "abstract.h"
_PyEval_Vector(tstate = 0x100ef278, con = 0x300fd59a, locals = 0x2ff1ea90, args = 0x20045994, argcount = 806339296, kwnames = 0x300ff6a0), line 46 in "pycore_ceval.h"