diff --git a/mixin.py b/mixin.py
index 1e75916..abd7a20 100644
--- a/mixin.py
+++ b/mixin.py
@@ -57,7 +57,7 @@ class EdocumentMixin(object):
         if not result.country:
             raise UserError(gettext(
                 'edocument_xrechnung.msg_no_address_country',
-                party=result.party))
+                party=result.party.rec_name if result.party else '-'))
         return result
 
     @cached_property
@@ -79,7 +79,7 @@ class EdocumentMixin(object):
         if result and not result.country:
             raise UserError(gettext(
                 'edocument_xrechnung.msg_no_address_country',
-                party=result.party))
+                party=result.party.rec_name if result.party else '-'))
         return result
 
     def get_list_of_comments(self):