FS-4378 --resolve 0 is success, thats the missing bit, this will work

src/mod/endpoints/mod_sofia/sofia.c

@@ -7409,7 +7409,7 @@ void sofia_handle_sip_i_refer(nua_t *nua, sofia_profile_t *profile, nua_handle_t
 		} else {
 			switch_event_t *event;
 
-			if (switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, MY_EVENT_ERROR)) {
+			if (switch_event_create_subclass(&event, SWITCH_EVENT_CUSTOM, MY_EVENT_ERROR) == SWITCH_STATUS_SUCCESS) {
 				switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Error-Type", "blind_transfer");
 				switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Transfer-Exten", exten);
 				switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "Full-Refer-To", full_ref_to);