diff --git a/src/g_shared/a_armor.cpp b/src/g_shared/a_armor.cpp
index 6dd39885d..6bed525d8 100644
--- a/src/g_shared/a_armor.cpp
+++ b/src/g_shared/a_armor.cpp
@@ -217,7 +217,7 @@ AInventory *ABasicArmorPickup::CreateCopy (AActor *other)
 	copy->MaxFullAbsorb = MaxFullAbsorb;
 
 	if (!(ItemFlags & IF_IGNORESKILL))
-	{ // extra ammo in baby mode and nightmare mode
+	{
 		SaveAmount = FixedMul(SaveAmount, G_SkillProperty(SKILLP_ArmorFactor));
 	}
 
@@ -300,7 +300,7 @@ AInventory *ABasicArmorBonus::CreateCopy (AActor *other)
 	copy->MaxFullAbsorb = MaxFullAbsorb;
 
 	if (!(ItemFlags & IF_IGNORESKILL))
-	{ // extra ammo in baby mode and nightmare mode
+	{
 		SaveAmount = FixedMul(SaveAmount, G_SkillProperty(SKILLP_ArmorFactor));
 	}
 	return copy;
diff --git a/src/nodebuild_extract.cpp b/src/nodebuild_extract.cpp
index 24fadcf3b..d8675aa6e 100644
--- a/src/nodebuild_extract.cpp
+++ b/src/nodebuild_extract.cpp
@@ -224,8 +224,16 @@ void FNodeBuilder::ExtractMini (FMiniBSP *bsp)
 			out->v2 = &bsp->Verts[org->v2];
 			out->backsector = org->backsector;
 			out->frontsector = org->frontsector;
-			out->linedef = Level.Lines + org->linedef;
-			out->sidedef = Level.Sides + org->sidedef;
+			if (org->sidedef != int(NO_SIDE))
+			{
+				out->linedef = Level.Lines + org->linedef;
+				out->sidedef = Level.Sides + org->sidedef;
+			}
+			else	// part of a miniseg
+			{
+				out->linedef = NULL;
+				out->sidedef = NULL;
+			}
 			out->PartnerSeg = NULL;
 			out->bPolySeg = false;
 		}
diff --git a/src/r_bsp.cpp b/src/r_bsp.cpp
index 8eebac3d5..71d4f210a 100644
--- a/src/r_bsp.cpp
+++ b/src/r_bsp.cpp
@@ -1032,7 +1032,7 @@ FMiniBSP::FMiniBSP()
 //
 //==========================================================================
 
-static void R_BuildPolyBSP(subsector_t *sub)
+void R_BuildPolyBSP(subsector_t *sub)
 {
 	assert((sub->BSP == NULL || sub->BSP->bDirty) && "BSP computed more than once");
 
diff --git a/src/r_bsp.h b/src/r_bsp.h
index 5701647a7..d8b00ec2a 100644
--- a/src/r_bsp.h
+++ b/src/r_bsp.h
@@ -75,6 +75,7 @@ EXTERN_CVAR (Bool, r_drawflat)		// [RH] Don't texture segs?
 // BSP?
 void R_ClearClipSegs (short left, short right);
 void R_ClearDrawSegs ();
+void R_BuildPolyBSP(subsector_t *sub);
 void R_RenderBSPNode (void *node);
 
 // killough 4/13/98: fake floors/ceilings for deep water / fake ceilings: