diff --git a/product/CMFActivity/ActivityTool.py b/product/CMFActivity/ActivityTool.py
index 72c72ce9884ca129a5adb67534ec5bb9e09529c7..d220a2c780a088e57173ddee1e8215d560a7d973 100644
--- a/product/CMFActivity/ActivityTool.py
+++ b/product/CMFActivity/ActivityTool.py
@@ -108,6 +108,7 @@ class Message:
     self.kw = kw
     self.is_executed = 0
     self.exc_type = None
+    self.exc_value = None
     self.processing = None
     self.user_name = str(_getAuthenticatedUser(self))
     # Store REQUEST Info ?