diff --git a/packages/webpack-cli/lib/webpack-cli.js b/packages/webpack-cli/lib/webpack-cli.js
index bb7661fc34c..0548c9a2550 100644
--- a/packages/webpack-cli/lib/webpack-cli.js
+++ b/packages/webpack-cli/lib/webpack-cli.js
@@ -67,7 +67,7 @@ class WebpackCLI {
     }
 
     // For babel/typescript
-    if (result && "default" in result) {
+    if (result && typeof result === "object" && "default" in result) {
       result = result.default || {};
     }