fix: workaround for duplicate instance

Author: pooya parsa

app/app.vue

@@ -202,6 +202,9 @@ export default {
       document.write(html)
       document.close()
 
+      // Destroy app
+      window._nuxtLoadingScreen.$destroy()
+
       // Clear console
       this.clearConsole()
     }

app/index.js

@@ -1,4 +1,8 @@
 import Vue from 'vue'
 import App from './app.vue'
 
-window.app = new Vue(App)
+if (window._nuxtLoadingScreen) {
+  location.reload(true) // Workaround
+} else {
+  window._nuxtLoadingScreen = new Vue(App)
+}