diff --git a/aiogram/types/base.py b/aiogram/types/base.py
index 9c24c703..dae52156 100644
--- a/aiogram/types/base.py
+++ b/aiogram/types/base.py
@@ -28,6 +28,8 @@ class TelegramObject(BotContextController, BaseModel):
         but UNSET might be passed to a model initialization from `Bot.method_name`,
         so we must take care of it and remove it before fields validation.
         """
+        if not isinstance(values, dict):
+            return values
         return {k: v for k, v in values.items() if not isinstance(v, UNSET_TYPE)}