diff --git a/stock_voucher_ux/controllers/main.py b/stock_voucher_ux/controllers/main.py
index 7a7921337..d0838a679 100644
--- a/stock_voucher_ux/controllers/main.py
+++ b/stock_voucher_ux/controllers/main.py
@@ -1,3 +1,7 @@
+##############################################################################
+# For copyright and license notices, see __manifest__.py file in module root
+# directory
+##############################################################################
 import io
 import json
 import re
@@ -21,7 +25,10 @@ def _count_pages_with_products(self, pdf_reader, picking_id):
         if not move_lines:
             move_lines = picking.move_ids
 
-        product_codes = [line.product_id.default_code or line.product_id.name for line in move_lines if line.product_id]
+        product_codes = [
+            line.product_id.default_code or line.product_id.name
+            for line in move_lines if line.product_id
+        ]
 
         pages_with_products = 0
 
@@ -54,7 +61,6 @@ def report_download(self, data, context=None):
         :returns: Response with a filetoken cookie and an attachment header
         """
         response = super().report_download(data, context)
-        # NTH detect if the binary is a PDF, no matter ifn it was generated by a QWeb or Aeroo
         requestcontent = json.loads(data)
         url, type = requestcontent[0], requestcontent[1]
         if type == "aeroo" and "remito" in url:
@@ -64,51 +70,62 @@ def report_download(self, data, context=None):
             assign = context_dict.get("assign")
             book_id = request.env["stock.picking"].browse(picking_id).book_id
             if assign and book_id and picking_id:
-                copies_result = request.env["ir.actions.report"].search_read(
-                    [("report_name", "ilike", "remito")], ["copies"], limit=1
-                )
-                copies = copies_result[0]["copies"] if copies_result else None
-                pdf_response = response.response[0]
-                reader = PdfFileReader(io.BytesIO(pdf_response))
-
-                # Usar el nuevo método para contar páginas con productos
-                if copies:
-                    total_pages = int(len(reader.pages) / copies)
-                    number_pages = self._count_pages_with_products(reader, picking_id)
-                    # Ajustar por número de copias
-                    number_pages = min(number_pages, total_pages)
-                else:
-                    number_pages = self._count_pages_with_products(reader, picking_id)
-
-                # See if there are vouchers already assigned. If not, then it assigns the vouchers
+                file_response = response.response[0]
+                number_pages = 1  # Default for non-PDF files
+
+                try:
+                    if file_response.startswith(b'%PDF'):
+                        copies_result = request.env["ir.actions.report"].search_read(
+                            [("report_name", "ilike", "remito")], ["copies"], limit=1
+                        )
+                        copies = copies_result[0]["copies"] if copies_result else None
+                        reader = PdfFileReader(io.BytesIO(file_response))
+
+                        # Usar el nuevo método para contar páginas con productos
+                        if copies:
+                            total_pages = int(len(reader.pages) / copies)
+                            number_pages = self._count_pages_with_products(reader, picking_id)
+                            # Ajustar por número de copias
+                            number_pages = min(number_pages, total_pages)
+                        else:
+                            number_pages = self._count_pages_with_products(reader, picking_id)
+                except Exception:
+                    number_pages = 1
+
                 if not request.env["stock.picking"].browse(picking_id).voucher_ids and book_id:
                     request.env["stock.picking"].browse(picking_id).assign_numbers(number_pages, book_id)
 
         elif "report_deliveryslip" in url:
-            # If the report is not an aeroo, the assign method should only assign one voucher
             match = re.search(r"(\d+)$", json.loads(data)[0])
             if match:
                 picking_id = int(match.group(1))
                 book_id = request.env["stock.picking"].browse(picking_id).book_id
                 if book_id and book_id.autoprinted == False and picking_id:
-                    pdf_response = response.response[0]
-                    reader = PdfFileReader(io.BytesIO(pdf_response))
-
-                    # Usar el nuevo método para contar páginas con productos
-                    copies_result = request.env["ir.actions.report"].search_read(
-                        [("report_name", "=", "stock.report_deliveryslip")], ["l10n_ar_copies"], limit=1
-                    )
-                    copies = copies_result[0]["l10n_ar_copies"] if copies_result else None
-
-                    if copies == "triplicado":
-                        total_pages = int(len(reader.pages) / 3)
-                    elif copies == "duplicado":
-                        total_pages = int(len(reader.pages) / 2)
-                    else:
-                        total_pages = len(reader.pages)
-
-                    number_pages = self._count_pages_with_products(reader, picking_id)
-                    number_pages = min(number_pages, total_pages)
+                    file_response = response.response[0]
+                    number_pages = 1  # Default for non-PDF files
+
+                    # Check if the response is a PDF by looking at the first few bytes
+                    try:
+                        if file_response.startswith(b'%PDF'):
+                            reader = PdfFileReader(io.BytesIO(file_response))
+                            # The number of pages will assign the number of vouchers
+                            copies = (
+                                request.env["ir.actions.report"]
+                                .search([("report_name", "=", "stock.report_deliveryslip")])
+                                .l10n_ar_copies
+                            )
+                            if copies == "triplicado":
+                                total_pages = int(len(reader.pages) / 3)
+                            elif copies == "duplicado":
+                                total_pages = int(len(reader.pages) / 2)
+                            else:
+                                total_pages = len(reader.pages)
+
+                            number_pages = self._count_pages_with_products(reader, picking_id)
+                            number_pages = min(number_pages, total_pages)
+                    except Exception:
+                        # If PDF reading fails, fallback to 1 page
+                        number_pages = 1
 
                     if not request.env["stock.picking"].browse(picking_id).voucher_ids and book_id:
                         request.env["stock.picking"].browse(picking_id).assign_numbers(number_pages, book_id)