AJAX request fails when sending FormData() including empty file input in Safari 10.13.4

Question

I am running a Symfony 2.8 based web app which sends some form data back to a controller using Ajax.

So far everything worked fine, but since the latest macOS update

Answer 1

Meanwhile I found this quick and dirty solution. But actually I am looking for a real workaround. Any ideas?

// Filter out empty file just before the Ajax request
// Use try/catch since Safari < 10.13.4 does not support FormData.entries()
try {
   for (var pair of data.entries()) {
      if (pair[1] instanceof File && pair[1].name == '' && pair[1].size == 0)
         data.delete(pair[0]);  
   }
} catch(e) {}