Problems with wicket serialization

Hi,

I have an application using Wicket 1.5.10 and I'm having problems with the
serialization of FileUpload component. The problem is that the FileUpload
creates a temporary file in the temp directory and when the wicket
deserializes the page, if file (*temp directory*) no exists the following
exception occurs:

https://gist.github.com/anonymous/c33ee20df9c68b118459

This problem only occurs when multiple browser tabs are open.

Suggestions of how to solve?

best,
Laécio.