diff --git a/src/server.js b/src/server.js
index 83156ee3a..6d78c363b 100644
--- a/src/server.js
+++ b/src/server.js
@@ -47,8 +47,8 @@ function initializeExpressSync() {
                 tokens.method(req, res),
                 tokens.url(req, res).replace(/(access_token=)[^&]+/, '$1' + '<redacted>'),
                 tokens.status(req, res),
-                res.errorBody.status,  // attached by connect-lastmile
-                res.errorBody.message, // attached by connect-lastmile
+                res.errorBody ? res.errorBody.status : '',  // attached by connect-lastmile. can be missing when router errors like 404
+                res.errorBody ? res.errorBody.message : '', // attached by connect-lastmile. can be missing when router errors like 404
                 tokens['response-time'](req, res), 'ms', '-',
                 tokens.res(req, res, 'content-length')
             ].join(' ');