diff --git a/src/mame/machine/megacdcd.c b/src/mame/machine/megacdcd.c
index f4259364de5..49ef6582952 100644
--- a/src/mame/machine/megacdcd.c
+++ b/src/mame/machine/megacdcd.c
@@ -357,6 +357,8 @@ void lc89510_temp_device::CDD_Play(running_machine &machine)
 	CLEAR_CDD_RESULT
 	UINT32 msf = getmsf_from_regs();
 	SCD_CURLBA = msf_to_lba(msf)-150;
+	if(segacd.cd == NULL) // no cd is there, bail out
+		return;
 	UINT32 end_msf = segacd.toc->tracks[ cdrom_get_track(segacd.cd, SCD_CURLBA) + 1 ].logframeofs;
 	SCD_CURTRK = cdrom_get_track(segacd.cd, SCD_CURLBA)+1;
 	LC8951UpdateHeader();
@@ -380,6 +382,8 @@ void lc89510_temp_device::CDD_Seek(void)
 	CLEAR_CDD_RESULT
 	UINT32 msf = getmsf_from_regs();
 	SCD_CURLBA = msf_to_lba(msf)-150;
+	if(segacd.cd == NULL) // no cd is there, bail out
+		return;
 	SCD_CURTRK = cdrom_get_track(segacd.cd, SCD_CURLBA)+1;
 	LC8951UpdateHeader();
 	STOP_CDC_READ
@@ -411,6 +415,8 @@ void lc89510_temp_device::CDD_Resume(running_machine &machine)
 {
 	CLEAR_CDD_RESULT
 	STOP_CDC_READ
+	if(segacd.cd == NULL) // no cd is there, bail out
+		return;
 	SCD_CURTRK = cdrom_get_track(segacd.cd, SCD_CURLBA)+1;
 	SCD_STATUS = CDD_PLAYINGCDDA;
 	CDD_STATUS = 0x0102;