diff --git a/source/app/models/main.py b/source/app/models/main.py
index 9591e47..1be4d80 100644
--- a/source/app/models/main.py
+++ b/source/app/models/main.py
@@ -3931,25 +3931,6 @@ class Facturas(BaseModel):
         query.execute()
         return
 
-    # ~ def _cancel_signature(self, id):
-        # ~ msg = 'Factura cancelada correctamente'
-        # ~ auth = Emisor.get_auth()
-        # ~ certificado = Certificado.select()[0]
-        # ~ obj = Facturas.get(Facturas.id==id)
-        # ~ data, result = util.cancel_signature(
-            # ~ obj.uuid, certificado.p12, certificado.rfc, auth)
-        # ~ if data['ok']:
-            # ~ obj.estatus = 'Cancelada'
-            # ~ obj.error = ''
-            # ~ obj.cancelada = True
-            # ~ obj.fecha_cancelacion = result['Fecha']
-            # ~ obj.acuse = result['Acuse']
-            # ~ self._actualizar_saldo_cliente(self, obj, True)
-        # ~ else:
-            # ~ obj.error = data['msg']
-        # ~ obj.save()
-        # ~ return data
-
     def _get_filters(self, values):
         if 'start' in values and 'end' in values:
             filters = Facturas.fecha.between(
@@ -5855,13 +5836,12 @@ class PreFacturas(BaseModel):
     def filter_years(cls):
         data = [{'id': -1, 'value': 'Todos'}]
         rows = (PreFacturas
-            .select(PreFacturas.fecha.year)
+            .select(PreFacturas.fecha.year.alias('year'))
             .group_by(PreFacturas.fecha.year)
             .order_by(PreFacturas.fecha.year)
-            .scalar(as_tuple=True)
         )
         if not rows is None:
-            data += [{'id': int(row), 'value': int(row)} for row in rows]
+            data += [{'id': int(r.year), 'value': int(r.year)} for r in rows]
         return tuple(data)
 
     @classmethod