diff --git a/themis/fields/vocabs.py b/themis/fields/vocabs.py
index fd5f36a..5c66549 100644
--- a/themis/fields/vocabs.py
+++ b/themis/fields/vocabs.py
@@ -47,7 +47,10 @@ class DeputiesSource(object):
         deputies = [x.getObject() for x in results]
         deputies.sort(cmp_person)
         def format_deputy(x):
-            return '%s %s (%s)' % (x.lastname, x.firstname, x.polgroup.to_object.title)
+            if x.polgroup:
+                return '%s %s (%s)' % (x.lastname, x.firstname, x.polgroup.to_object.title)
+            else:
+                return '%s %s (?)' % (x.lastname, x.firstname)
         deputies_terms = [SimpleVocabulary.createTerm(
                                 'deputy:'+x.id, 'deputy:'+x.id, format_deputy(x))
                                 for x in deputies]