You call git log without deactivating colors.
A user who has configures git to always print color will see a weird error message cause the regex-parser won't match. You can fix this by adding the option -c color.ui=never before the log in git log.
Generally you should add this option to all of your git commands and specially you could look into my own thin wrapper around git commands ;-) https://github.com/payload/node-treeeater/
I discovered this error while using https://github.com/mklabs/nabe
Is this still an issue? I've been swamped and had this issue starred to look at later.
since there is no -c color.ui=never in gitExec
nor in args
i bet it is still an issue.
though i didn't test it.