diff --git a/index.js b/index.js
index db2e051..45a2753 100644
--- a/index.js
+++ b/index.js
@@ -71,7 +71,11 @@ function process_route(route, description, path, req, res, callback) {
   }
 
   if (!supported_version(req.body.version)) {
-    console.log(`${timestamp()} ${error()}${req.body.username ?? 'Anonymous'} is using a too-old version of the client - ${req.body.version}`);
+    if (req.body.username) {
+      console.log(`${timestamp()} ${error()}${req.body.username} is using a too-old version of the client - ${req.body.version}`);
+    } else {
+      console.log(`${timestamp()} ${error()}'Anonymous user is using a too-old version of the client - ${req.body.version}`);
+    }
     res.send(`Obsolete client workbook, version ${req.body.version}`);
     return;
   }