From 6f6f756d700a7b6e3a122f12b6fdf6b3c42f1834 Mon Sep 17 00:00:00 2001
From: Endi <endiliey@gmail.com>
Date: Wed, 1 Jan 2020 17:49:12 +0700
Subject: [PATCH] fix(v2): filter out invalid prefetch script without
 contenthash (#2167)

---
 packages/docusaurus/src/client/docusaurus.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/docusaurus/src/client/docusaurus.js b/packages/docusaurus/src/client/docusaurus.js
index 71d40de97c..5a3efce118 100644
--- a/packages/docusaurus/src/client/docusaurus.js
+++ b/packages/docusaurus/src/client/docusaurus.js
@@ -58,7 +58,10 @@ const docusaurus = {
       // Pass it the chunkName or chunkId you want to load and it will return the URL for that chunk
       // eslint-disable-next-line no-undef
       const chunkAsset = __webpack_require__.gca(chunkName);
-      if (chunkAsset) {
+
+      // In some cases, webpack might decide to optimize further & hence the chunk asssets are merged to another chunk/previous chunk
+      // Hence, we can safely filter it out/ dont need to load it
+      if (chunkAsset && !/undefined/.test(chunkAsset)) {
         prefetchHelper(chunkAsset);
       }
     });