Repo can not be found when executed in git worktree

[LukasFritzeDev]

When using git worktrees, the command fails with the following error:

> git-semver
failed to retrieve repo head: reference not found

My setup is as follows

> git worktree list
/Users/lfritze/services/my-service         3431fb59 [feature/a]
/Users/lfritze/services/my-service-master  7af8d7f9 [master]

• /Users/lfritze/services/my-service holds the repo and is the main working tree
• /Users/lfritze/services/my-service-master is an additional working tree
• current directory is the additional working tree /Users/lfritze/services/my-service-master