I can not longer amend a commit from source tree because it seems unable to read my user/email to pass to the --author parameter:

git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree commit -q --amend --author "invalid author" -F /var/folders/fw/bqblx7jd79q40cgspr7dbk0h0000gn/T/SourceTreeTemp.h50okf
fatal: --author 'invalid author' is not 'Name <email>' and matches no existing author
Completed with errors, see above

I tried changing per repository and global user properties in source tree, even restarted the application - nothing works.
Also cleared fields, restarted, refilling still not works.