Sorry, I don’t know. Do you have a .git subdirectory? What is in it?
In my case, the config file looks like this:
# cat .git/config
[core]
repositoryformatversion = 0
filemode = true
bare = false
logallrefupdates = true
[remote "origin"]
url = https://github.com/discourse/discourse_docker.git
fetch = +refs/heads/*:refs/remotes/origin/*
[branch "main"]
remote = origin
merge = refs/heads/main
But this is for reference. I don’t think the fix is to edit a config file!