diff --git a/index.js b/index.js
index 4aa82c02..a9cfd392 100644
--- a/index.js
+++ b/index.js
@@ -91,7 +91,8 @@ class HtmlWebpackPlugin {
         : (entryName) => userOptionFilename.replace(/\[name\]/g, entryName);
 
       /** output filenames for the given entry names */
-      const outputFileNames = new Set(Object.keys(compiler.options.entry).map(filenameFunction));
+      const entryNames = Object.keys(compiler.options.entry);
+      const outputFileNames = new Set((entryNames.length ? entryNames : ['main']).map(filenameFunction));
 
       /** Option for every entry point */
       const entryOptions = Array.from(outputFileNames).map((filename) => ({
diff --git a/spec/basic.spec.js b/spec/basic.spec.js
index f97b5316..13fd6a55 100644
--- a/spec/basic.spec.js
+++ b/spec/basic.spec.js
@@ -2667,4 +2667,19 @@ describe('HtmlWebpackPlugin', () => {
       ]
     }, ['<img src="/foo/assets/demo.png'], 'demo/index.js', done);
   });
+
+  it('generates an html file if entry is empty', done => {
+    testHtmlPlugin({
+      mode: 'development',
+      entry: {},
+      output: {
+        path: OUTPUT_DIR,
+        filename: 'index_bundle.js',
+        assetModuleFilename: 'assets/demo[ext]'
+      },
+      plugins: [
+        new HtmlWebpackPlugin({})
+      ]
+    }, ['<body>'], null, done);
+  });
 });
