UnicodeEncodeError ao buscar termos no vocabulário

[idgserpro]

Quando buscamos um termo no campo VCGE da aba Categorization ocorre o erro:

2017-12-12 15:55:46 ERROR Zope.SiteErrorLog 1513101346.760.99411670276 http://localhost:8080/Plone/@@token-search
Traceback (innermost last):
  Module ZPublisher.Publish, line 138, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 48, in call_object
  Module brasil.gov.vcge.dx.widget, line 184, in __call__
UnicodeEncodeError: 'ascii' codec can't encode character u'\xe1' in position 12: ordinal not in range(128)

[hvelarde]

posso confirmar este problema.