diff --git a/bt5/erp5_crm/ExtensionTemplateItem/CRMMigration.py b/bt5/erp5_crm/ExtensionTemplateItem/CRMMigration.py
index 0e1e60eff44ebbfd91f36d2faf65d8e7a8b0825b..4839b32fcb16c3d4c9ebb9f6f2758c1b27a9eb32 100644
--- a/bt5/erp5_crm/ExtensionTemplateItem/CRMMigration.py
+++ b/bt5/erp5_crm/ExtensionTemplateItem/CRMMigration.py
@@ -62,5 +62,5 @@ def migrateEventWorkflowHistory(self):
     return
   workflow_tool = portal.portal_workflow
   workflow_tool._jumpToStateFor(self, new_state)
-  return 'Event workflow migration on %s : %s -> %s' % (
-      self.getPath(), current_state, new_state)
+  return ['Event workflow migration on %s : %s -> %s' % (
+      self.getPath(), current_state, new_state)]
diff --git a/bt5/erp5_crm/bt/revision b/bt5/erp5_crm/bt/revision
index 55b22b1aa9f24be59e8f86153e626c19e03f575e..bccc87b80ef7af97083b3cda3f315937e89f1673 100644
--- a/bt5/erp5_crm/bt/revision
+++ b/bt5/erp5_crm/bt/revision
@@ -1 +1 @@
-580
\ No newline at end of file
+581
\ No newline at end of file