diff --git a/product/CMFActivity/ActivityTool.py b/product/CMFActivity/ActivityTool.py
index 1de625a7465100db3cbf28033ab757a6aaf7eb71..5cd6925c4d8b7173bd055583296820daafd4bd10 100644
--- a/product/CMFActivity/ActivityTool.py
+++ b/product/CMFActivity/ActivityTool.py
@@ -820,6 +820,8 @@ class ActivityTool (Folder, UniqueObject):
                 activity_kw = m.activity_kw.copy()
                 if 'group_method_id' in activity_kw:
                   del activity_kw['group_method_id']
+                if 'group_id' in activity_kw:
+                  del activity_kw['group_id']
                 active_obj = obj.activate(**activity_kw)
                 getattr(active_obj, alternate_method_id)(*m.args, **m.kw)
               else: