Error !

IndexError: string index out of range

285
	neuarray.append(lehrer)

286
%>

287
<td class="LehrPerson">

288
	${h.prepteachers(neuarray,replacefields,currentsem,il,lang)}

289
</td>

290
</tr>

291
% endif

292


293
</%def>
/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)
/var/www/vlvz.py/vlvz/templates/lehrangebot-functions.mako, line 288:
288
	${h.prepteachers(neuarray,replacefields,currentsem,il,lang)}
/var/www/vlvz.py/vlvz/templates/lehrangebot-functions.mako, line 167:
167
<%def name="eventrows(subject,modules)">
/var/www/vlvz.py/vlvz/templates/lehrangebot-functions.mako, line 207:
207
    ${eventrowangebot(modules,subject,e['type'],audiences,e['sws'],'',e['sp'])}
/var/www/vlvz.py/vlvz/templates/lehrangebot-functions.mako, line 8:
8
<%def name="angebotlist(degrees)">
/var/www/vlvz.py/vlvz/templates/lehrangebot-functions.mako, line 67:
67
		${eventrows(s,m)}
/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)