diff --git a/release/scripts/mgear/core/attribute.py b/release/scripts/mgear/core/attribute.py
index f302b2b5..7efc4ac3 100644
--- a/release/scripts/mgear/core/attribute.py
+++ b/release/scripts/mgear/core/attribute.py
@@ -792,6 +792,7 @@ def __init__(self, scriptName, value=False):
 
         self.scriptName = scriptName
         self.value = value
+        self.valueType = None
         self.param_dict = {}
 
     def create(self, node):