diff --git a/rero_ils/modules/items/serializers/collector.py b/rero_ils/modules/items/serializers/collector.py
index da9915b705..50877011aa 100644
--- a/rero_ils/modules/items/serializers/collector.py
+++ b/rero_ils/modules/items/serializers/collector.py
@@ -283,7 +283,7 @@ def append_document_data(csv_data, documents):
         except Exception as err:
             current_app.logger.error(
                 "ERROR in csv serializer: "
-                f'{message} on document: {csv_data.get("document_pid")}'
+                f'{err} on document: {csv_data.get("document_pid")}'
             )
 
     @classmethod