Processor bug with "foerster-geisteswissenschaft"

I've got another feedback from an user, who can't generate bibliographies with my style (foerster-geisteswissenschaft)
http://www.zotero.org/styles/foerster-geisteswissenschaft

If he is selecting a book (only happens with greek letters!), right click for bibliography, choose my style and then "copy paste", Zotero shows: "Ein Fehler ist aufgetreten bei dem Versuch, das Literaturverzeichnis zu erstellen. Bitte erneut versuchen."
It works well with other styles. In console, Firefox shows "invalid context".
Do you have an idea, what is wrong?

(Copied from another tread in wrong forum:
https://forums.zotero.org/discussion/21916/submitting-style-zoterosf/#Item_40)
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