Fatal git error on .git/modules/libffi-tarballs

Hello, while working on HEAD and after a few iteraction of ./validate my git complains with: $ git status fatal: Not a git repository: /export/home/karel/vcs/ghc-src/ghc-git-test-2/.git/modules/libffi-tarballs karel@silence:~/vcs/ghc-src/ghc-solaris-validate-fix$ Is this a known error or is there any known workaround for this issue? Thanks! Karel