diff --git a/sapl/audiencia/forms.py b/sapl/audiencia/forms.py
index 211db9855..f1978032f 100755
--- a/sapl/audiencia/forms.py
+++ b/sapl/audiencia/forms.py
@@ -115,7 +115,7 @@ class AudienciaForm(FileFieldCheckMixin, forms.ModelForm):
                     numero=materia,
                     ano=ano_materia,
                     tipo=tipo_materia)
-            except ObjectDoesNotExist:
+            except (ObjectDoesNotExist, ValueError):
                 msg = _('A matéria %s nº %s/%s não existe no cadastro'
                         ' de matérias legislativas.' % (tipo_materia, materia, ano_materia))
                 self.logger.warning(
diff --git a/sapl/utils.py b/sapl/utils.py
index ee97094aa..42d4b2c6e 100644
--- a/sapl/utils.py
+++ b/sapl/utils.py
@@ -1395,8 +1395,9 @@ class MultiFormatOutputMixin:
         return {fmt: fields for fmt in self.formats_impl}
 
     def render_to_response(self, context, **response_kwargs):
-        format_result = getattr(self.request, self.request.method).get(
-            'format', None)
+        # HEAD shares query params with GET; Django has no request.HEAD attribute.
+        _method = 'GET' if self.request.method == 'HEAD' else self.request.method
+        format_result = getattr(self.request, _method).get('format', None)
 
         if format_result:
             if format_result not in self.formats_impl: