From bb56c676c9c100d8619c7714ccae5569fca0c48b Mon Sep 17 00:00:00 2001
From: "Eric P. Nusbaum" <eric@enusbaum.com>
Date: Mon, 14 Mar 2022 16:43:42 -0400
Subject: [PATCH] Fix a Race Condition if a disconnect were to happen during
 processing loop

---
 MBBSEmu/HostProcess/ExportedModules/ExportedModuleBase.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/MBBSEmu/HostProcess/ExportedModules/ExportedModuleBase.cs b/MBBSEmu/HostProcess/ExportedModules/ExportedModuleBase.cs
index 07ef10cb..4529d7ca 100644
--- a/MBBSEmu/HostProcess/ExportedModules/ExportedModuleBase.cs
+++ b/MBBSEmu/HostProcess/ExportedModules/ExportedModuleBase.cs
@@ -681,7 +681,11 @@ private protected ReadOnlySpan<byte> ProcessTextVariables(ReadOnlySpan<byte> out
 
             var txtvarsFound = _textVariableService.ExtractVariableDefinitions(outputBuffer);
 
-            var txtvarDictionary = ChannelDictionary[ChannelNumber].SessionVariables;
+            //This can happen if a channel disconnects during the processing of the main loop
+            if (!ChannelDictionary.TryGetValue(ChannelNumber, out var channelSession))
+                return outputBuffer;
+
+            var txtvarDictionary = channelSession.SessionVariables;
 
             //Get Their Values
             var txtvarMemoryBase = Module.Memory.GetVariablePointer("TXTVARS");