diff --git a/index.js b/index.js
index be4ab2ef..0518b121 100644
--- a/index.js
+++ b/index.js
@@ -453,12 +453,14 @@ class HtmlWebpackPlugin {
       }
 
       // Webpack outputs an array for each chunk when using sourcemaps
-      // But we need only the entry file
+      // But we need only the initial entry file in case it is a js file
       const entry = chunkFiles[0];
-      assets.chunks[chunkName].size = chunk.size;
-      assets.chunks[chunkName].entry = entry;
-      assets.chunks[chunkName].hash = chunk.hash;
-      assets.js.push(entry);
+      if (/.js($|\?)/.test(entry)) {
+        assets.chunks[chunkName].size = chunk.size;
+        assets.chunks[chunkName].entry = entry;
+        assets.chunks[chunkName].hash = chunk.hash;
+        assets.js.push(entry);
+      }
 
       // Gather all css files
       const css = chunkFiles.filter(chunkFile => /.css($|\?)/.test(chunkFile));