I've run into this serious error while committing, and created a bug report.
I keep getting this error on TortoiseGit operations:
git did not exit cleanly (exit code 128)
I've reinstalled the program, rebooted, and tried to clone a fresh repo from github - nothing seems to work. I also deleted %appdata%\Tortoise git folder ... I'm at a loss now. Any advice on how to proceed?
Deleting index.lock worked for me
For me, I tried to check out a SVN-project with TortoiseGit. It worked fine if I used TortoiseSVN though. (May seem obvious, but newcomers may stumble on this one)