diff --git a/src/emu/device.c b/src/emu/device.c
index 5eeee60c9a3..d1f0e389cb4 100644
--- a/src/emu/device.c
+++ b/src/emu/device.c
@@ -124,10 +124,6 @@ device_t::~device_t()
 
 memory_region *device_t::memregion(const char *_tag) const
 {
-	// safety first
-	if (this == NULL)
-		return NULL;
-
 	// build a fully-qualified name and look it up
 	return machine().memory().region(subtag(_tag).c_str());
 }
@@ -140,10 +136,6 @@ memory_region *device_t::memregion(const char *_tag) const
 
 memory_share *device_t::memshare(const char *_tag) const
 {
-	// safety first
-	if (this == NULL)
-		return NULL;
-
 	// build a fully-qualified name and look it up
 	return machine().memory().shared(subtag(_tag).c_str());
 }
@@ -156,10 +148,6 @@ memory_share *device_t::memshare(const char *_tag) const
 
 memory_bank *device_t::membank(const char *_tag) const
 {
-	// safety first
-	if (this == NULL)
-		return NULL;
-
 	// build a fully-qualified name and look it up
 	return machine().memory().bank(subtag(_tag).c_str());
 }
@@ -172,10 +160,6 @@ memory_bank *device_t::membank(const char *_tag) const
 
 ioport_port *device_t::ioport(const char *tag) const
 {
-	// safety first
-	if (this == NULL)
-		return NULL;
-
 	// build a fully-qualified name and look it up
 	return machine().ioport().port(subtag(tag).c_str());
 }
@@ -188,10 +172,6 @@ ioport_port *device_t::ioport(const char *tag) const
 
 std::string device_t::parameter(const char *tag) const
 {
-	// safety first
-	if (this == NULL)
-		return NULL;
-
 	// build a fully-qualified name and look it up
 	return machine().parameters().lookup(subtag(tag));
 }
diff --git a/src/emu/device.h b/src/emu/device.h
index b6b245c8490..438e590afc6 100644
--- a/src/emu/device.h
+++ b/src/emu/device.h
@@ -584,10 +584,6 @@ private:
 
 inline device_t *device_t::subdevice(const char *tag) const
 {
-	// safety first
-	if (this == NULL)
-		return NULL;
-
 	// empty string or NULL means this device
 	if (tag == NULL || *tag == 0)
 		return const_cast<device_t *>(this);
@@ -605,10 +601,6 @@ inline device_t *device_t::subdevice(const char *tag) const
 
 inline device_t *device_t::siblingdevice(const char *tag) const
 {
-	// safety first
-	if (this == NULL)
-		return NULL;
-
 	// empty string or NULL means this device
 	if (tag == NULL || *tag == 0)
 		return const_cast<device_t *>(this);
diff --git a/src/emu/memory.h b/src/emu/memory.h
index 7503301453e..8bb32d636d3 100644
--- a/src/emu/memory.h
+++ b/src/emu/memory.h
@@ -653,7 +653,7 @@ public:
 
 	// getters
 	memory_share *next() const { return m_next; }
-	void *ptr() const { if (this == NULL) return NULL; return m_ptr; }
+	void *ptr() const { return m_ptr; }
 	size_t bytes() const { return m_bytes; }
 	endianness_t endianness() const { return m_endianness; }
 	UINT8 bitwidth() const { return m_bitwidth; }