diff --git a/lib/transport.js b/lib/transport.js
index 5dc31e5..1130fe9 100644
--- a/lib/transport.js
+++ b/lib/transport.js
@@ -124,7 +124,7 @@ bot.on('error', (err) => {
     logger.warn(`${MODULE_NAME} F2E53C12: Error detected.`, {
         xid,
         eCode: err.code,
-        eMessage: err.message,
+        eMessage: err.message || err,
     });
 
     if (!config.do_not_terminate_on_error) {