diff --git a/chatsky/core/ctx_dict.py b/chatsky/core/ctx_dict.py
index 788e30650..51d7f5401 100644
--- a/chatsky/core/ctx_dict.py
+++ b/chatsky/core/ctx_dict.py
@@ -391,6 +391,9 @@ def _validate_model(value: Any, handler: Callable[[Any], "ContextDict"], _) -> "
                 instance._removed = value["removed"]
                 instance._ctx_id = value["ctx_id"]
                 instance._field_name = value["field_name"]
+            else:
+                instance._items = dict()
+                instance._keys = set()
             return instance
         else:
             raise ValueError(f"Unknown type of ContextDict value: {type(value).__name__}.")