Does not work for "git am" commands

[leolux]

When executing a git am command git complains about a missing identity:
fatal: empty ident name (for <>) not allowed

It seems that there is a bug in the library because:

1. The same command works in all terminals, cmd, powershell, git bash without issues
2. User name and email are set both globally and locally in git and this is ensured by outputting them prior to executing the git am command
3. The git patch itself is well formatted because it has been directly procuded by git format-patch

Has anyone else had isuses with git commit or git am?