From 76572532a05c20ce3eff3f3472c137467064d944 Mon Sep 17 00:00:00 2001
From: David Haywood <mamehaze@users.noreply.github.com>
Date: Mon, 25 Jan 2016 00:19:08 +0000
Subject: [PATCH] fix regression (nw)

---
 src/mame/machine/sms.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/mame/machine/sms.cpp b/src/mame/machine/sms.cpp
index 8b709dcb815..bf50bb12d15 100644
--- a/src/mame/machine/sms.cpp
+++ b/src/mame/machine/sms.cpp
@@ -851,8 +851,11 @@ void sms_state::setup_media_slots()
 
 void sms_state::setup_bios()
 {
-	m_BIOS = memregion("user1")->base();
-	m_bios_page_count = (m_BIOS ? memregion("user1")->bytes() / 0x4000 : 0);
+	if (memregion("user1") != nullptr)
+	{
+		m_BIOS = memregion("user1")->base();
+		m_bios_page_count = (m_BIOS ? memregion("user1")->bytes() / 0x4000 : 0);
+	}
 
 	if (m_BIOS == nullptr || m_BIOS[0] == 0x00)
 	{