diff --git a/.gitignore b/.gitignore
index dd92c9f..3b45768 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,12 @@ docs/bk/
 source/docs/
 site/
 vedev/
+
+# Virtualenv
+.env/
+virtual/
+
+docs/
 cache/
 credenciales.conf
 *.sqlite
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d942214..4af3088 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+v 1.28.1 [04-mar-2019]
+----------------------
+    - Error: Al buscar facturas por fechas
+
+
 v 1.28.0 [17-feb-2019]
 ----------------------
     - Mejora: Manejo de empaques para mensajeria
diff --git a/VERSION b/VERSION
index cfc7307..450a687 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.28.0
+1.28.1
diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index f4c2e2b..e13da50 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -1666,12 +1666,19 @@ def to_pdf_from_json(rfc, version, data):
     if exists(path_logo):
         data['emisor']['logo2'] = path_logo
 
+    path_cbb = data['timbre']['path_cbb']
     path = get_path_temp()
+
     pdf = TemplateInvoice(path)
     pdf.custom_styles = custom_styles
     pdf.data = data
     pdf.render()
-    return read_file(path)
+
+    data = read_file(path)
+    _kill(path)
+    _kill(path_cbb)
+
+    return data
 
 
 def format_currency(value, currency, digits=2):
diff --git a/source/app/models/main.py b/source/app/models/main.py
index 95dd6db..8b2f159 100644
--- a/source/app/models/main.py
+++ b/source/app/models/main.py
@@ -3720,7 +3720,7 @@ class Facturas(BaseModel):
         return data
 
     def _get_filters(self, values):
-        if 'start' in values:
+        if 'start' in values and 'end' in values:
             filters = Facturas.fecha.between(
                 utils.parse_date(values['start']),
                 utils.parse_date(values['end'], True)
@@ -9913,6 +9913,7 @@ def _exportar_documentos():
             Facturas.get_pdf(row['id'], rfc, True)
             msg = '\tPDF generado...'
             log.info(msg)
+
     log.info('Documentos exportados...')
     return
 
diff --git a/source/app/settings.py b/source/app/settings.py
index 74da420..3c774c4 100644
--- a/source/app/settings.py
+++ b/source/app/settings.py
@@ -47,7 +47,7 @@ except ImportError:
 
 
 DEBUG = DEBUG
-VERSION = '1.28.0'
+VERSION = '1.28.1'
 EMAIL_SUPPORT = ('soporte@empresalibre.mx',)
 TITLE_APP = '{} v{}'.format(TITLE_APP, VERSION)
 
diff --git a/source/static/js/controller/admin.js b/source/static/js/controller/admin.js
index e577f4d..cbc3392 100644
--- a/source/static/js/controller/admin.js
+++ b/source/static/js/controller/admin.js
@@ -1640,6 +1640,12 @@ function cmd_agregar_impuesto_click(){
         return
     }
 
+    if(impuesto='ISR' || tasa > 0){
+        msg = 'El impuesto ISR debe ser tipo Retención'
+        msg_error(msg)
+        return
+    }
+
     msg = 'Datos correctos.<BR><BR>¿Estás seguro de agregar este impuesto?'
     webix.confirm({
         title: 'Agregar impuesto',
diff --git a/source/static/js/controller/invoices.js b/source/static/js/controller/invoices.js
index 6e8cd2c..47c2982 100644
--- a/source/static/js/controller/invoices.js
+++ b/source/static/js/controller/invoices.js
@@ -1383,6 +1383,12 @@ function cmd_invoice_cancelar_click(){
 
 function get_filters_invoices(){
     var filters = $$('filter_dates').getValue()
+
+    if(filters['start'] && !filters['end']){
+        msg = 'No seleccionaste la fecha final'
+        msg_error(msg)
+    }
+
     filters['year'] = $$('filter_year').getValue()
     filters['month'] = $$('filter_month').getValue()
     filters['client'] = $$('grid_invoices').getFilter('cliente').value
@@ -2296,7 +2302,6 @@ function search_by(value){
             };
         }
     });
-
 }