diff --git a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs
index d473f6a9d..29ff74305 100644
--- a/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs
+++ b/Barotrauma/BarotraumaShared/SharedSource/LuaCs/LuaCsSetup.cs
@@ -320,6 +320,10 @@ namespace Barotrauma
 
 		public DynValue CallLuaFunction(object function, params object[] args)
 		{
+            // XXX: `lua` might be null if `LuaCsSetup.Stop()` is called while
+            // a patched function is still running.
+            if (lua == null) return null;
+
 			lock (lua)
 			{
 				try