diff --git a/src/farchive.cpp b/src/farchive.cpp
index 477d22718..fc3d75bbb 100644
--- a/src/farchive.cpp
+++ b/src/farchive.cpp
@@ -1054,6 +1054,12 @@ FArchive &FArchive::SerializePointer (void *ptrbase, BYTE **ptr, DWORD elemSize)
 
 FArchive &FArchive::SerializeObject (DObject *&object, PClass *type)
 {
+	if (!m_ThinkersAllowed && type->IsDescendantOf(RUNTIME_CLASS(DThinker)))
+	{
+		assert(true);
+		I_Error("Tried to serialize a thinker before P_SerializeThinkers");
+	}
+
 	if (!type->IsDescendantOf(RUNTIME_CLASS(PClass)))
 	{ // a regular object
 		if (IsStoring())
diff --git a/src/farchive.h b/src/farchive.h
index b6722986a..44ae8c001 100644
--- a/src/farchive.h
+++ b/src/farchive.h
@@ -216,6 +216,16 @@ inline	FArchive& operator<< (signed char *&str) { return operator<< ((char *&)st
 inline	FArchive& operator<< (bool &b) { return operator<< ((BYTE &)b); }
 inline  FArchive& operator<< (DObject* &object) { return ReadObject (object, RUNTIME_CLASS(DObject)); }
 
+	void EnableThinkers()
+	{
+		m_ThinkersAllowed = true;
+	}
+
+	bool ThinkersAllowed()
+	{
+		return m_ThinkersAllowed;
+	}
+
 protected:
 		enum { EObjectHashSize = 137 };
 
@@ -253,6 +263,7 @@ protected:
 
 		int *m_SpriteMap;
 		size_t m_NumSprites;
+		bool m_ThinkersAllowed = false;
 
 		FArchive ();
 		void AttachToFile (FFile &file);
diff --git a/src/g_shared/a_quake.cpp b/src/g_shared/a_quake.cpp
index 1d1117125..7908c907c 100644
--- a/src/g_shared/a_quake.cpp
+++ b/src/g_shared/a_quake.cpp
@@ -72,10 +72,7 @@ void DEarthquake::Serialize (FArchive &arc)
 		<< m_QuakeSFX << m_Flags << m_CountdownStart
 		<< m_WaveSpeed
 		<< m_Falloff << m_Highpoint << m_MiniCount;
-	if (SaveVersion >= 4544)
-	{
-		arc << m_RollIntensity << m_RollWave;
-	}
+		<< m_RollIntensity << m_RollWave;
 }
 
 //==========================================================================
diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index 9af2cd573..af5992488 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -423,7 +423,6 @@ void P_SerializeWorld (FArchive &arc)
 				<< si->LeftSide
 				<< si->RightSide
 				<< si->Index;
-			DBaseDecal::SerializeChain (arc, &si->AttachedDecals);
 		}
 	}
 
@@ -452,6 +451,7 @@ void P_SerializeWorldActors(FArchive &arc)
 {
 	int i;
 	sector_t *sec;
+	line_t *line;
 
 	for (i = 0, sec = sectors; i < numsectors; i++, sec++)
 	{
@@ -465,6 +465,16 @@ void P_SerializeWorldActors(FArchive &arc)
 	{
 		arc << s.mSkybox;
 	}
+	for (i = 0, line = lines; i < numlines; i++, line++)
+	{
+		for (int s = 0; s < 2; s++)
+		{
+			if (line->sidedef[s] != NULL)
+			{
+				DBaseDecal::SerializeChain(arc, &line->sidedef[s]->AttachedDecals);
+			}
+		}
+	}
 }
 
 void extsector_t::Serialize(FArchive &arc)
@@ -504,6 +514,7 @@ FArchive &operator<< (FArchive &arc, sector_t::splane &p)
 
 void P_SerializeThinkers (FArchive &arc, bool hubLoad)
 {
+	arc.EnableThinkers();
 	DImpactDecal::SerializeTime (arc);
 	DThinker::SerializeAll (arc, hubLoad);
 }
diff --git a/src/version.h b/src/version.h
index 096efa48c..21d05b3ed 100644
--- a/src/version.h
+++ b/src/version.h
@@ -72,11 +72,11 @@ const char *GetVersionString();
 // SAVESIG should match SAVEVER.
 
 // MINSAVEVER is the minimum level snapshot version that can be loaded.
-#define MINSAVEVER	4543
+#define MINSAVEVER	4545
 
 // Use 4500 as the base git save version, since it's higher than the
 // SVN revision ever got.
-#define SAVEVER 4544
+#define SAVEVER 4545
 
 #define SAVEVERSTRINGIFY2(x) #x
 #define SAVEVERSTRINGIFY(x) SAVEVERSTRINGIFY2(x)
diff --git a/wadsrc/static/xlat/eternity.txt b/wadsrc/static/xlat/eternity.txt
index bfdac2cec..bc5159d11 100644
--- a/wadsrc/static/xlat/eternity.txt
+++ b/wadsrc/static/xlat/eternity.txt
@@ -231,3 +231,6 @@ enum
 444 = 0, Teleport(0)
 445 = 0, Teleport_NoFog(0)
 446 = 0, Teleport_Line(0)
+447 = 0, Exit_Normal(0)
+448 = 0, Exit_Secret(0)
+449 = 0, Teleport_NewMap(0)