Fix segv

src/switch_ivr_originate.c

@@ -1423,8 +1423,10 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_enterprise_originate(switch_core_sess
 		}
 	}
 
-	switch_event_add_header_string(var_event, SWITCH_STACK_BOTTOM, "ent_originate_aleg_uuid", switch_core_session_get_uuid(session));
-
+	if (session) {
+		switch_event_add_header_string(var_event, SWITCH_STACK_BOTTOM, "ent_originate_aleg_uuid", switch_core_session_get_uuid(session));
+	}
+	
 	if (channel) {
 		switch_channel_process_export(channel, NULL, var_event, SWITCH_EXPORT_VARS_VARIABLE);
 	}