url have been changed from 0.0.0.0 to localhost

src/electron/main.ts

@@ -9,7 +9,7 @@ import * as url from 'url';
 // });
 
 const indexUrl = url.format({
-  pathname: path.join('//0.0.0.0:4200'),
+  pathname: path.join('//localhost:4200'),
   protocol: 'http:',
   slashes: true
 });