diff --git a/tryton/tryton/gui/window/view_form/model/record.py b/tryton/tryton/gui/window/view_form/model/record.py
index 665bb1e4f7..4b29539e66 100644
--- a/tryton/tryton/gui/window/view_form/model/record.py
+++ b/tryton/tryton/gui/window/view_form/model/record.py
@@ -747,7 +747,7 @@ class Record:
                 'model', self.model_name, 'on_scan_code', values, code,
                 context=self.get_context(), process_exception=False)
         except RPCException:
-            changes = []
+            return False
         self.set_on_change(changes)
         self.set_modified()
         return bool(changes)