diff --git a/printing_auto_base/models/printing_auto.py b/printing_auto_base/models/printing_auto.py
index 7fe3242d19a..0b66a7730a5 100644
--- a/printing_auto_base/models/printing_auto.py
+++ b/printing_auto_base/models/printing_auto.py
@@ -102,7 +102,7 @@ def _get_content(self, records):
         if generate_data_func:
             records = self._get_record(records)
             for record in records:
-                content.append(generate_data_func(record)[0])
+                content += generate_data_func(record)
         return content
 
     def _prepare_attachment_domain(self, record):