commit https://github.com/vim/vim/commit/11fbc2866ccc11b4dd1726abdaf582a78ef3f743 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Sep 2 21:48:32 2016 +0200 patch 7.4.2309 Problem: Crash when doing tabnext in a BufUnload autocmd. (Dominique Pelle) Solution: When detecting that the tab page changed, don't just abort but delete the window where w_buffer is NULL.

TYPEMAP
VIWIN	T_VIOBJNOMUNGE
VIBUF	T_VIOBJNOMUNGE

INPUT
T_VIOBJNOMUNGE
	if (sv_isa($arg, \"${ntype}\")) {
	    IV tmp = SvIV((SV*)SvRV($arg));
	    $var = INT2PTR($type, tmp);
	    if (!tmp)
		croak(\"$ntype no longer exists\");
	}
	else
	    croak(\"$var is not of type ${ntype}\")