diff --git a/tryton/gui/window/view_form/view/graph.py b/tryton/gui/window/view_form/view/graph.py
index 6d4d6a16ef..75c43fc037 100644
--- a/tryton/gui/window/view_form/view/graph.py
+++ b/tryton/gui/window/view_form/view/graph.py
@@ -44,3 +44,6 @@ class ViewGraph(ParserView):
 
     def set_cursor(self, new=False, reset_view=True):
         pass
+
+    def get_fields(self):
+        return []