From cf653b5b5654a0f3faef76387693e3bd46ef9f7a Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Sun, 7 Aug 2022 01:42:09 -0600
Subject: [PATCH] qbsp: MakeNodePortal: don't crash if w is empty

for consistency with qbsp3
---
 qbsp/portals.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/qbsp/portals.cc b/qbsp/portals.cc
index f58a6533..e6f18b52 100644
--- a/qbsp/portals.cc
+++ b/qbsp/portals.cc
@@ -227,6 +227,9 @@ std::unique_ptr<buildportal_t> MakeNodePortal(node_t *node, const std::list<std:
 
     // clip the portal by all the other portals in the node
     for (auto &p : boundary_portals) {
+        if (!w) {
+            break;
+        }
         qplane3d plane;
 
         if (p->nodes[0] == node) {