From cc8c20adf8608521dba7d38668cbdaf3628777d5 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Mon, 9 Jan 2017 20:53:37 +0100
Subject: [PATCH] - fixed: non-existent partner segs were not properly
 initialized.

---
 src/p_setup.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/p_setup.cpp b/src/p_setup.cpp
index ad713fab98..82a2adc9c2 100644
--- a/src/p_setup.cpp
+++ b/src/p_setup.cpp
@@ -930,7 +930,8 @@ void P_LoadGLZSegs (FileReaderBase &data, int type)
 			{
 				seg[-1].v2 = seg->v1;
 			}
-			seg->PartnerSeg = &segs[partner];
+			
+			seg->PartnerSeg = partner == 0xffffffffu? nullptr : &segs[partner];
 			if (line != 0xFFFFFFFF)
 			{
 				line_t *ldef;