From 196bb0349ccbd8ef1a50a587dbe64708209ecbbe Mon Sep 17 00:00:00 2001
From: danij <danij@dengine.net>
Date: Mon, 11 Mar 2013 02:39:09 +0000
Subject: [PATCH] Vertex: Fixed oversight in the previous cleanup refactoring

---
 doomsday/client/src/map/vertex.cpp | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/doomsday/client/src/map/vertex.cpp b/doomsday/client/src/map/vertex.cpp
index 61230c51fe..d71ddcce47 100644
--- a/doomsday/client/src/map/vertex.cpp
+++ b/doomsday/client/src/map/vertex.cpp
@@ -57,19 +57,21 @@ void Vertex::countLineOwners(uint *oneSided, uint *twoSided) const
 
     uint ones = 0, twos = 0;
 
-    LineOwner const *firstOwn = firstLineOwner();
-    LineOwner const *own = firstOwn;
-    do
+    if(LineOwner const *firstOwn = firstLineOwner())
     {
-        if(!own->lineDef().L_frontsidedef || !own->lineDef().L_backsidedef)
+        LineOwner const *own = firstOwn;
+        do
         {
-            ++ones;
-        }
-        else
-        {
-            ++twos;
-        }
-    } while((own = &own->next()) != firstOwn);
+            if(!own->lineDef().L_frontsidedef || !own->lineDef().L_backsidedef)
+            {
+                ++ones;
+            }
+            else
+            {
+                ++twos;
+            }
+        } while((own = &own->next()) != firstOwn);
+    }
 
     if(oneSided) *oneSided += ones;
     if(twoSided) *twoSided += twos;