Index: channels/chan_iax2.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_iax2.c,v
retrieving revision 1.229
diff -u -r1.229 chan_iax2.c
--- channels/chan_iax2.c	26 Dec 2004 22:33:25 -0000	1.229
+++ channels/chan_iax2.c	29 Dec 2004 19:01:53 -0000
@@ -5561,7 +5561,7 @@
 				ast_log(LOG_DEBUG, "Immediately destroying %d, having received hangup\n", fr.callno);
 				/* Set hangup cause according to remote */
 				ast_log(LOG_NOTICE, "Remote sent causecode %d\n", ies.causecode);
-				if (ies.causecode)
+				if (iaxs[fr.callno]->owner && ies.causecode)
 					iaxs[fr.callno]->owner->hangupcause = ies.causecode;
 				/* Send ack immediately, before we destroy */
 				send_command_immediate(iaxs[fr.callno], AST_FRAME_IAX, IAX_COMMAND_ACK, fr.ts, NULL, 0,fr.iseqno);