diff --git a/src/g_shared/a_decals.cpp b/src/g_shared/a_decals.cpp
index ebbaaf197..7eea30fef 100644
--- a/src/g_shared/a_decals.cpp
+++ b/src/g_shared/a_decals.cpp
@@ -116,13 +116,16 @@ void DBaseDecal::Destroy ()
 
 void DBaseDecal::Remove ()
 {
-	if (WallPrev == nullptr) Side->AttachedDecals = WallNext;
+	if (WallPrev == nullptr)
+	{
+		if (Side != nullptr) Side->AttachedDecals = WallNext;
+	}
 	else WallPrev->WallNext = WallNext;
 
 	if (WallNext != nullptr) WallNext->WallPrev = WallPrev;
 
-	WallPrev = NULL;
-	WallNext = NULL;
+	WallPrev = nullptr;
+	WallNext = nullptr;
 }
 
 void DBaseDecal::Serialize(FSerializer &arc)
diff --git a/src/g_shared/a_sectoraction.cpp b/src/g_shared/a_sectoraction.cpp
index 397fa1a89..da3830d74 100644
--- a/src/g_shared/a_sectoraction.cpp
+++ b/src/g_shared/a_sectoraction.cpp
@@ -49,23 +49,26 @@ bool ASectorAction::IsActivatedByUse() const
 
 void ASectorAction::Destroy ()
 {
-	// Remove ourself from this sector's list of actions
-	AActor *probe = Sector->SecActTarget;
-	union
+	if (Sector != nullptr)
 	{
-		AActor **act;
-		ASectorAction **secact;
-	} prev;
-	prev.secact = &Sector->SecActTarget;
+		// Remove ourself from this sector's list of actions
+		AActor *probe = Sector->SecActTarget;
+		union
+		{
+			AActor **act;
+			ASectorAction **secact;
+		} prev;
+		prev.secact = &Sector->SecActTarget;
 
-	while (probe && probe != this)
-	{
-		prev.act = &probe->tracer;
-		probe = probe->tracer;
-	}
-	if (probe != NULL)
-	{
-		*prev.act = probe->tracer;
+		while (probe && probe != this)
+		{
+			prev.act = &probe->tracer;
+			probe = probe->tracer;
+		}
+		if (probe != nullptr)
+		{
+			*prev.act = probe->tracer;
+		}
 	}
 
 	Super::Destroy ();
diff --git a/src/g_shared/a_skies.cpp b/src/g_shared/a_skies.cpp
index 72091e098..89c785e3e 100644
--- a/src/g_shared/a_skies.cpp
+++ b/src/g_shared/a_skies.cpp
@@ -170,7 +170,10 @@ void ASectorSilencer::BeginPlay ()
 
 void ASectorSilencer::Destroy ()
 {
-	Sector->Flags &= ~SECF_SILENT;
+	if (Sector != nullptr)
+	{
+		Sector->Flags &= ~SECF_SILENT;
+	}
 	Super::Destroy ();
 }
 
diff --git a/src/r_data/r_interpolate.cpp b/src/r_data/r_interpolate.cpp
index df8773879..c944f0fa5 100644
--- a/src/r_data/r_interpolate.cpp
+++ b/src/r_data/r_interpolate.cpp
@@ -418,15 +418,18 @@ DSectorPlaneInterpolation::DSectorPlaneInterpolation(sector_t *_sector, bool _pl
 
 void DSectorPlaneInterpolation::Destroy()
 {
-	if (ceiling) 
+	if (sector != nullptr)
 	{
-		sector->interpolations[sector_t::CeilingMove] = NULL;
+		if (ceiling)
+		{
+			sector->interpolations[sector_t::CeilingMove] = nullptr;
+		}
+		else
+		{
+			sector->interpolations[sector_t::FloorMove] = nullptr;
+		}
+		sector = nullptr;
 	}
-	else 
-	{
-		sector->interpolations[sector_t::FloorMove] = NULL;
-	}
-
 	for(unsigned i=0; i<attached.Size(); i++)
 	{
 		attached[i]->DelRef();
@@ -593,13 +596,17 @@ DSectorScrollInterpolation::DSectorScrollInterpolation(sector_t *_sector, bool _
 
 void DSectorScrollInterpolation::Destroy()
 {
-	if (ceiling) 
+	if (sector != nullptr)
 	{
-		sector->interpolations[sector_t::CeilingScroll] = NULL;
-	}
-	else 
-	{
-		sector->interpolations[sector_t::FloorScroll] = NULL;
+		if (ceiling)
+		{
+			sector->interpolations[sector_t::CeilingScroll] = nullptr;
+		}
+		else
+		{
+			sector->interpolations[sector_t::FloorScroll] = nullptr;
+		}
+		sector = nullptr;
 	}
 	Super::Destroy();
 }
@@ -694,7 +701,11 @@ DWallScrollInterpolation::DWallScrollInterpolation(side_t *_side, int _part)
 
 void DWallScrollInterpolation::Destroy()
 {
-	side->textures[part].interpolation = NULL;
+	if (side != nullptr)
+	{
+		side->textures[part].interpolation = nullptr;
+		side = nullptr;
+	}
 	Super::Destroy();
 }
 
@@ -788,7 +799,10 @@ DPolyobjInterpolation::DPolyobjInterpolation(FPolyObj *po)
 
 void DPolyobjInterpolation::Destroy()
 {
-	poly->interpolation = NULL;
+	if (poly != nullptr)
+	{
+		poly->interpolation = nullptr;
+	}
 	Super::Destroy();
 }