Hello axure people

I touched the wrong button when i wanted to rename my Master file..I DELETED IT...  I know, i am stupid not to hit the crtl-S button every 10 seconds, but now the master is gone.. !  

Is there an option to bring it back ?? (it took me a long time creating the master)  

 thnks

btw: what an irritating 'select tags' pop-up... There are scrollbars everywhere...