diff --git a/source/games/duke/src/player_d.cpp b/source/games/duke/src/player_d.cpp
index d565ef322..73c0b7a63 100644
--- a/source/games/duke/src/player_d.cpp
+++ b/source/games/duke/src/player_d.cpp
@@ -2851,7 +2851,7 @@ void processinput_d(int snum)
 	pact->spr.xvel = clamp(ksqrt((p->pos.X - p->bobpos.X) * (p->pos.X - p->bobpos.X) + (p->pos.Y - p->bobpos.Y) * (p->pos.Y - p->bobpos.Y)), 0, 512);
 	if (p->on_ground) p->bobcounter += p->GetActor()->spr.xvel >> 1;
 
-	p->backuppos(ud.clipping == 0 && (p->cursector->floorpicnum == MIRROR || !p->insector()));
+	p->backuppos(ud.clipping == 0 && ((p->insector() && p->cursector->floorpicnum == MIRROR) || !p->insector()));
 
 	// Shrinking code
 
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index 768aefa5a..dee0c624f 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -3566,7 +3566,7 @@ void processinput_r(int snum)
 	pact->spr.xvel = clamp(ksqrt((p->pos.X - p->bobpos.X) * (p->pos.X - p->bobpos.X) + (p->pos.Y - p->bobpos.Y) * (p->pos.Y - p->bobpos.Y)), 0, 512);
 	if (p->on_ground) p->bobcounter += p->GetActor()->spr.xvel >> 1;
 
-	p->backuppos(ud.clipping == 0 && (p->cursector->floorpicnum == MIRROR || !p->insector()));
+	p->backuppos(ud.clipping == 0 && ((p->insector() && p->cursector->floorpicnum == MIRROR) || !p->insector()));
 
 	// Shrinking code