revert

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -429,6 +429,10 @@ switch_status_t sofia_on_hangup(switch_core_session_t *session)
 		gateway_ptr = sofia_reg_find_gateway(gateway_name);
 	}
 
+	if (!tech_pvt) {
+		return SWITCH_STATUS_SUCCESS;
+	}
+
 	switch_mutex_lock(tech_pvt->sofia_mutex);
 
 	rec = sofia_test_flag(tech_pvt, TFLAG_RECOVERING);