From 26170419f428649208c1d28f78d8fe442361f5be Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@users.noreply.github.com>
Date: Mon, 9 Jan 2017 23:23:26 +0100
Subject: [PATCH] - fixed: The stair builder code tried to access a member of a
 null pointer after finding no more stair sectors.

---
 src/p_floor.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/p_floor.cpp b/src/p_floor.cpp
index 48c73f131..d81ec8bf4 100644
--- a/src/p_floor.cpp
+++ b/src/p_floor.cpp
@@ -663,9 +663,8 @@ bool EV_BuildStairs (int tag, DFloor::EStair type, line_t *line,
 						sec = tsec;
 						continue;
 					}
-					
+					newsecnum = tsec->Index();
 				}
-				newsecnum = tsec->sectornum;
 			}
 			else
 			{