diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index 02e9979..c8421e1 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -811,6 +811,9 @@ class LIBO(object):
                 col5.append((float(valor_unitario),))
                 col6.append((float(importe),))
 
+        if not count:
+            return
+
         col = cell_1.getCellAddress().Column
         target1 = self._sheet.getCellRangeByPosition(col, row+1, col, row+count)
         col = cell_2.getCellAddress().Column
diff --git a/source/static/js/controller/invoices.js b/source/static/js/controller/invoices.js
index e2d8e26..ed97e97 100644
--- a/source/static/js/controller/invoices.js
+++ b/source/static/js/controller/invoices.js
@@ -173,6 +173,7 @@ function default_config(){
         if(values.cfdi_edu){
             $$('grid_details').showColumn('student')
         }
+        show('fs_students', values.cfdi_edu)
     })
 }