Check type of __vueify_style__ before disposing

My app failed to update when using browserify-hmr. I add this type-check then it works.
vuejs · fzhantw · Jun 24, 2016 · Jun 24, 2016 · Jun 30, 2016 · Jun 30, 2016
commit b16002654290293a407a4cf8a5dfb3141671c342
diff --git a/lib/compiler.js b/lib/compiler.js
@@ -156,7 +156,7 @@ compiler.compile = function (content, filePath, cb) {
         '  hotAPI.install(require("vue"), true)\n' +
         '  if (!hotAPI.compatible) return\n' +
         // remove style tag on dispose
-        (style
+        (style && 'object' === typeof(__vueify_style__) && __vueify_style__ instanceof Node
           ? '  module.hot.dispose(function () {\n' +
             '    __vueify_insert__.cache[' + style + '] = false\n' +
             '    document.head.removeChild(__vueify_style__)\n' +