diff --git a/lib/cli/run.js b/lib/cli/run.js
index 1cb4ecea5a..1203e992fd 100644
--- a/lib/cli/run.js
+++ b/lib/cli/run.js
@@ -369,7 +369,12 @@ exports.handler = async function (argv) {
   try {
     await runMocha(mocha, argv);
   } catch (err) {
-    console.error('\n' + (err.stack || `Error: ${err && err.message}`), err);
+    if (!err) {
+      console.error('\n Undefined error:`, err);
+    } else {
+      console.error('\n' + (err.stack || `Error: ${err.message}`), err);
+    }
+    
     process.exit(1);
   }
 };