diff --git a/lib/cli/run.js b/lib/cli/run.js
index 92908be435..66c8cbbb66 100644
--- a/lib/cli/run.js
+++ b/lib/cli/run.js
@@ -369,12 +369,7 @@ exports.handler = async function (argv) {
   try {
     await runMocha(mocha, argv);
   } catch (err) {
-    if (!err || !err.toString) {
-      console.error('\n Undefined error:', err);
-    } else {
-      console.error('\n' + (err.stack || `Error: ${err.message || err}`));
-    }
-
+    console.error('\n Exception during run:', err);
     process.exit(1);
   }
 };