Freezes when try to fetchtag inside subfolder

If I am inside a sb folder I am getting following error:

```bash
$ semver tag
Traceback (most recent call last):
9: from /usr/local/bin/semver:23:in `'
8: from /usr/local/bin/semver:23:in `load'
7: from /var/lib/gems/2.7.0/gems/semver-1.0.1/bin/semver:58:in `'
6: from /var/lib/gems/2.7.0/gems/semver-1.0.1/lib/semver.rb:10:in `find'
5: from /var/lib/gems/2.7.0/gems/semver-1.0.1/lib/semver.rb:20:in `find_file'
4: from /var/lib/gems/2.7.0/gems/semver-1.0.1/lib/semver.rb:20:in `chdir'
3: from /var/lib/gems/2.7.0/gems/semver-1.0.1/lib/semver.rb:22:in `block in find_file'
2: from /var/lib/gems/2.7.0/gems/semver-1.0.1/lib/semver.rb:22:in `loop'
1: from /var/lib/gems/2.7.0/gems/semver-1.0.1/lib/semver.rb:25:in `block (2 levels) in find_file'
/var/lib/gems/2.7.0/gems/semver-1.0.1/lib/semver.rb:25:in `[]': Interrupt
```

How can I fix this error?