From 6dcd7e2557116d4e834dd087d0951b59b2bb03f0 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Mon, 30 Aug 2021 23:15:53 +0200
Subject: [PATCH] - do not crash on badly defined walls where the end point is
 missing.

---
 source/core/sectorgeometry.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/source/core/sectorgeometry.cpp b/source/core/sectorgeometry.cpp
index 96bffadfb..4248d2091 100644
--- a/source/core/sectorgeometry.cpp
+++ b/source/core/sectorgeometry.cpp
@@ -346,6 +346,7 @@ bool SectorGeometry::MakeVertices2(unsigned int secnum, int plane, const FVector
 	for (int i = 0; i < numvertices; i++)
 	{
 		auto sline = &sectionLines[sec->lines[i]];
+		if (sline->point2index < 0) continue; // Exhumed LEV14 triggers this on sector 169.
 
 		auto wallp = &wall[sline->startpoint];
 		vertexes[j].p = { wallp->x * (1 / 16.), wallp->y * (1 / -16.) };