diff --git a/product/CMFActivity/Activity/SQLDict.py b/product/CMFActivity/Activity/SQLDict.py
index 9eefeedebeb195f279a14acb3873cfcb980146f5..61bed4d7ed5ff3142b5ca487fcb44ff8c7741d25 100755
--- a/product/CMFActivity/Activity/SQLDict.py
+++ b/product/CMFActivity/Activity/SQLDict.py
@@ -192,6 +192,7 @@ class SQLDict(RAMDict):
         if list(m.object_path) == list(object_path) and (method_id is None or method_id == m.method_id):
           activity_tool.unregisterMessage(self, m)
           if not method_dict.has_key(method_id):
+            method_dict[method_id] = 1 # Prevents calling invoke twice
             if invoke:
               # First Validate
               if m.validate(self, activity_tool):