diff --git a/lib/cli/run.js b/lib/cli/run.js
index fbbe510e94..1cb4ecea5a 100644
--- a/lib/cli/run.js
+++ b/lib/cli/run.js
@@ -369,7 +369,7 @@ exports.handler = async function (argv) {
   try {
     await runMocha(mocha, argv);
   } catch (err) {
-    console.error('\n' + (err.stack || `Error: ${err.message || err}`));
+    console.error('\n' + (err.stack || `Error: ${err && err.message}`), err);
     process.exit(1);
   }
 };