Fix chunk filtering

index.js

@@ -90,7 +90,7 @@ HtmlWebpackPlugin.prototype.didChunkFilesChange = function(chunks) {
   var files = _.flatten(chunks.map(function(chunk) {
     return chunk.files;
   }));
-  if(_.difference(files, this.filesOfLastRun).length > 0) {
+  if(!this.filesOfLastRun || _.difference(files, this.filesOfLastRun).length > 0) {
     this.filesOfLastRun = files;
     return true;
   }
@@ -249,7 +249,7 @@ HtmlWebpackPlugin.prototype.addFileToAssets = function(filename, compilation) {
  */
 HtmlWebpackPlugin.prototype.filterChunks = function (webpackStatsJson, includedChunks, excludedChunks) {
   var chunks = webpackStatsJson.chunks.filter(function(chunk){
-    var chunkName = chunk.names;
+    var chunkName = chunk.names[0];
     // Skip if the chunks should be filtered and the given chunk was not added explicity
     if (Array.isArray(includedChunks) && includedChunks.indexOf(chunkName) === -1) {
       return false;

spec/HtmlWebpackPluginSpec.js

@@ -23,6 +23,11 @@ function testHtmlPlugin(webpackConfig, expectedResults, outputFile, done, expect
       expect(compilationWarnings).not.toBe('');
     } else {
       expect(compilationWarnings).toBe('');
+    }
+    var outputFileExists = fs.existsSync(path.join(OUTPUT_DIR, outputFile));
+    expect(outputFileExists).toBe(true);
+    if(!outputFileExists) {
+      return done();
     }    
     var htmlContent = fs.readFileSync(path.join(OUTPUT_DIR, outputFile)).toString();
     for (var i = 0; i < expectedResults.length; i++) {