Error !

IndexError: string index out of range

19
<center><div style="text-align:center">${autocompleteHTML.lectures()}</div></center><br />

20
#2#	${kvlinfo(subject)}

21
% elif degrees is not UNDEFINED:

22
	${angebotlist(degrees)}

23
% endif

24
<%def name='filter()'>

25
% if subject is not UNDEFINED or onlyevent is False:

26
Auswahl Lehrperson:

27
     <%include file="/filter.mako"/>
/var/www/vlvz.py/vlvz/ab/helpers.py, line 157:
157
teachersnew = (u'<a href="/{0}/{1}/lehrkraefte/{2}/?teacher={3}">{3}</a>'.format(currentsem,il,lang,prepteacher(t[0],replacefields)) for t in teachers)
/var/www/vlvz.py/vlvz/ab/helpers.py, line 159:
159
return u", ".join(teachersnew)
_lehrangebot_functions_mako, line 407:
407
_lehrangebot_functions_mako, line 74:
74
_lehrangebot_functions_mako, line 125:
125
_lehrangebot_functions_mako, line 232:
232
_lehrangebot_functions_mako, line 305:
305
/var/www/vlvz.py/vlvz/templates/lehrangebot.mako, line 22:
22
	${angebotlist(degrees)}
/var/www/vlvz.py/vlvz/templates/base.mako, line 422:
422
${self.body()}
/usr/lib/python2.7/dist-packages/mako/runtime.py, line 899:
899
callable_(context, *args, **kwargs)
/usr/lib/python2.7/dist-packages/mako/runtime.py, line 873:
873
_exec_template(inherit, lclcontext, args=args, kwargs=kwargs)
/usr/lib/python2.7/dist-packages/mako/runtime.py, line 838:
838
**_kwargs_for_callable(callable_, data))
/usr/lib/python2.7/dist-packages/mako/template.py, line 462:
462
return runtime._render(self, self.callable_, args, data)
/var/www/vlvz.py/vlvz/webvlvz2.py, line 334:
334
return tpl.render(**data)