Startup error "You are not currently on a branch"

[abcsds]

The following error appears when starting git-webui:

Checking for update...
You are not currently on a branch.
Please specify which branch you want to rebase against.
See git-pull(1) for details.

    git pull <remote> <branch>

Checking for update...

This repeats over and over again, without starting git-webui. I made sure both the repo I want to visualize, and the git-webui repo are on the origin/master branch.

Steps to reproduce:

• clone git-webui
• manually install
• run

This also happens when only cloning the repo, and directly running the git-webui executable under ./release/libexec/git-core/git-webui

I have pull.rebase true as a global config, but I also tried to disable it and the result didn't change.

Thanks!