From 09e40d2bae3e01db31692630a9cd1ea140a4d6ae Mon Sep 17 00:00:00 2001
From: biwa <6475593+biwa@users.noreply.github.com>
Date: Fri, 23 Oct 2020 21:04:49 +0200
Subject: [PATCH] DECALDEF parser: fixed a crash when there are duplicate decal
 group entries in the DECALDEF files

---
 Source/Core/ZDoom/DecalInfo.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Source/Core/ZDoom/DecalInfo.cs b/Source/Core/ZDoom/DecalInfo.cs
index df15efeb..9446e913 100644
--- a/Source/Core/ZDoom/DecalInfo.cs
+++ b/Source/Core/ZDoom/DecalInfo.cs
@@ -197,7 +197,15 @@ namespace CodeImp.DoomBuilder.ZDoom
 				}
 
 				// Add name of child to the list of children
-				childdecals.Add(token, null);
+				if (childdecals.ContainsKey(token))
+				{
+					// TODO: report problem
+
+					// Overwrite existing decal with new one (who knows if that's the correct way do handle duplicate entries?)
+					childdecals[token] = null;
+				}
+				else
+					childdecals.Add(token, null);
 
 				// Read the probability wheight. We don't use it, though
 				int weight = 0;