diff --git a/lib/helpers.js b/lib/helpers.js
index ef188f6..a2e13d5 100644
--- a/lib/helpers.js
+++ b/lib/helpers.js
@@ -37,7 +37,7 @@ const reduceAssets = (files, asset, moduleAssets) => {
     });
   }
 
-  const isEntryAsset = asset.chunks.length > 0;
+  const isEntryAsset = asset.chunks && asset.chunks.length > 0;
   if (isEntryAsset) {
     return files;
   }