diff --git a/meteor/flaskdgraph/dgraph_types.py b/meteor/flaskdgraph/dgraph_types.py
index d6e85da..196b1e1 100644
--- a/meteor/flaskdgraph/dgraph_types.py
+++ b/meteor/flaskdgraph/dgraph_types.py
@@ -1631,6 +1631,9 @@ class ListDatetime(DateTime):
     dgraph_predicate_type = "[datetime]"
     _type = list
 
+    def __init__(self, overwrite=True, *args, **kwargs) -> None:
+        super().__init__(overwrite=overwrite, *args, **kwargs)
+
     def validation_hook(self, data):
         if data is None:
             return None