If you are on Linux, just delete the '~/.gitconfig' or '/home/$USER/.gitconfig' file. This will take git to an unconfigured state. The problem was that somehow the configuration file got changed by some unwanted operation and the value of `gpgsign` was set to `null`. Deleting the file or deleting the line containing `gpgsign` should solve the problem.
Ok I managed to fix the issue following this post https://stackoverflow.com/questions/39494631/gpg-failed-to-sign-the-data-fatal-failed-to-write-commit-object-git-2-10-0 and Shayan Amani answer. Basically we need to update our gpgsign and sync the email with it inside GitHub.
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