Quiz with "." in title not working

[TEbinger]

I tried to make a Quiz with the title "Kirchengeschichte Kl. 9". You get no error message about the title. Persons joining are displayed only with a page reload. When You try to start it, You get a strange message "Frage undefined" "Frage NaN / 3".
Because that was my first quiz that was very strange for me and I thoght arsnova.click would'nt work for me at all.