Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 94843)
+++ channels/chan_sip.c	(working copy)
@@ -10040,7 +10040,11 @@
 	struct sip_request *req = oreq ? oreq : &p->initreq;
 	struct sip_refer *referdata = p->refer;
 	const char *transfer_context = NULL;
-	
+
+	/* If no refer structure, then do nothing */
+	if (!p->refer)
+		return 1;
+
 	ast_copy_string(tmp, get_header(req, "Also"), sizeof(tmp));
 	c = get_in_brackets(tmp);