From a89bc237897d91191a27b770b74b7cf6ace2ed6e Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sun, 10 Dec 2017 13:24:16 +0200
Subject: [PATCH] Fixed crash when loading saved game with missing ACS module

---
 src/p_acs.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 3d93e7a0a5..22afac1b63 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -3655,6 +3655,12 @@ void DLevelScript::Serialize(FSerializer &arc)
 	if (arc.isReading())
 	{
 		activeBehavior = FBehavior::StaticGetModule(lib);
+
+		if (nullptr == activeBehavior)
+		{
+			I_Error("Could not find ACS module");
+		}
+
 		pc = activeBehavior->Ofs2PC(pcofs);
 	}
 }