diff --git a/odex25_realstate/property_management/models/end_rental_contract.py b/odex25_realstate/property_management/models/end_rental_contract.py
index 2d37ad4f8..02a8564b1 100644
--- a/odex25_realstate/property_management/models/end_rental_contract.py
+++ b/odex25_realstate/property_management/models/end_rental_contract.py
@@ -217,9 +217,11 @@ class PropertyManagementMaintenance(models.Model):
             self.partner_id = False
 
     def _prepare_invoice_values(self, maintenance, amount):
+        # Check if unit_ids is not empty before accessing the first element
+        unit_name = self.unit_ids[0].name if self.unit_ids else ' '
         origin = _(
-            'Maintenance Order') + ' ' + maintenance.name + ' '+self.property_id.name+'  ' +self.unit_ids[0].name+' ' +maintenance.partner_id.name if maintenance.partner_id else \
-            _('Maintenance Order') + ' ' + maintenance.name +' '+self.property_id.name+'  ' +self.unit_ids[0].name+' ' + maintenance.vendor_id.name
+            'Maintenance Order') + ' ' + maintenance.name + ' '+self.property_id.name+'  ' +unit_name+' ' +maintenance.partner_id.name if maintenance.partner_id else \
+            _('Maintenance Order') + ' ' + maintenance.name +' '+self.property_id.name+'  ' +unit_name+' ' + maintenance.vendor_id.name
         line_data = []
         for line in maintenance.end_line_ids:
             line_data.append((0, 0, {