diff --git a/midas/checker/python.py b/midas/checker/python.py
index 7569f1b..705498b 100644
--- a/midas/checker/python.py
+++ b/midas/checker/python.py
@@ -257,6 +257,9 @@ class PythonTyper(
         """
         unfolded: Type = unfold_type(obj[1])
         match unfolded:
+            case TopType() | UnknownType():
+                return UnknownType()
+
             case DataFrameType():
                 return self.frame_mgr.call(
                     method=method_name,