diff --git a/product/ERP5/Tool/WorkflowTool.py b/product/ERP5/Tool/WorkflowTool.py
index 246a156e58fdcfd3ac00d23a8a25be0a14afa345..7b0f6bc694212ab8ff80074e6fb834fe226fd78f 100644
--- a/product/ERP5/Tool/WorkflowTool.py
+++ b/product/ERP5/Tool/WorkflowTool.py
@@ -203,7 +203,7 @@ class WorkflowTool(BaseTool, OriginalWorkflowTool):
         portal_type_id = None
 
     if portal_type_id is None:
-        workflow_list
+        return workflow_list
 
     portal_type = self.getPortalObject().portal_types._getOb(portal_type_id, None)