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Bug? Error during commit

I am using git frequently and usually it is running great.
I read to write to this eMail address regarding problems and possible bugs.
I am using git version 2.16.1.windows.2 / 64 Bit and during commit the following error message comes up:
e:\Internet>git commit -m 2018-01-27
fatal: unable to generate diffstat for Thunderbird/andreas-kalz.de/Mail/pop.gmx.net/Inbox
[master f74cf30] 2018-01-27
I also tried this before with an older git version with same problem.
Can you help me with this problem please? Thanks in advance.
All the best,