Comment 7 for bug 1501244

the patch will be enough:
get_current_realname() will return username=NULL, and action_state_for_header will correct it to "":
label = show_name && real_name ? real_name : "";

Our users are not in /etc/passwd, but accessed by libnss-winbind, and sometimes the connection is quite slow or winbindd hangs.

Thanks for your answers.