diff --git a/tiramisu/option.py b/tiramisu/option.py
index 540fd2e..79ef025 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -79,7 +79,10 @@ class Multi(list):
                 raise IndexError("in a group with a master, you mustn't add "
                         "a value in a slave's Multi value")
         except TypeError:
+            # Not a master/slaves
             self._setvalue(value, who=settings.get_owner())
+            return
+
         multis = []
         for opt in self.config._cfgimpl_descr._children:
             if isinstance(opt, OptionDescription):