diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index 9d0189f41..49d479b5a 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -525,9 +525,12 @@ FSerializer &Serialize(FSerializer &arc, const char *key, FPolyObj &poly, FPolyO
 
 		if (arc.isReading())
 		{
-			poly.RotatePolyobj(angle, true);
-			delta -= poly.StartSpot.pos;
-			poly.MovePolyobj(delta, true);
+			if (poly.OriginalPts.Size() > 0)
+			{
+				poly.RotatePolyobj(angle, true);
+				delta -= poly.StartSpot.pos;
+				poly.MovePolyobj(delta, true);
+			}
 		}
 	}
 	return arc;
diff --git a/src/playsim/po_man.cpp b/src/playsim/po_man.cpp
index 8d100bb71..f19cf102c 100644
--- a/src/playsim/po_man.cpp
+++ b/src/playsim/po_man.cpp
@@ -945,7 +945,7 @@ bool FPolyObj::RotatePolyobj (DAngle angle, bool fromsave)
 
 	UnLinkPolyobj();
 
-	for(unsigned i=0;i < Vertices.Size(); i++)
+	for(unsigned i=0;i < OriginalPts.Size(); i++)
 	{
 		PrevPts[i].pos = Vertices[i]->fPos();
 		FPolyVertex torot = OriginalPts[i];