From 72e20028d1a5c7bedfcde56429d211d8e427c7a4 Mon Sep 17 00:00:00 2001
From: UbitUmarov
Date: Wed, 23 Nov 2016 20:26:14 +0000
Subject:  safeguard against unknown material replacemet

---
 OpenSim/Region/OptionalModules/Materials/MaterialsModule.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/OpenSim/Region/OptionalModules/Materials/MaterialsModule.cs b/OpenSim/Region/OptionalModules/Materials/MaterialsModule.cs
index 006b730..7312bc3 100644
--- a/OpenSim/Region/OptionalModules/Materials/MaterialsModule.cs
+++ b/OpenSim/Region/OptionalModules/Materials/MaterialsModule.cs
@@ -532,7 +532,7 @@ namespace OpenSim.Region.OptionalModules.Materials
 
                                         lock(m_Materials)
                                         {
-                                            if(oldid != UUID.Zero)
+                                            if(oldid != UUID.Zero && m_MaterialsRefCount.ContainsKey(oldid))
                                             {
                                                 m_MaterialsRefCount[oldid]--;
                                                 if(m_MaterialsRefCount[oldid] <= 0)
-- 
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