Artifact in git commit window

Sometime ago I used a link to non-existent file in my mockery tests. And somehow PhpStorm has recognized it as a real new file which can be committed. I cannot delete it, I cannot shelf it or whatsoever. It is just a ghost. I though I could invalidate cache, but it did not help. 

Normally, it is just there and has no impact on commit process (I cannot commit it even if I choose it),  but as I open commit window to check new files, this artifact confuses me every time. 
Is there a way to get rid of it without reinstalling phpstorm?