diff --git a/dlk/python/dlk/core/view.py b/dlk/python/dlk/core/view.py
index 2846924b4..16c617bc0 100644
--- a/dlk/python/dlk/core/view.py
+++ b/dlk/python/dlk/core/view.py
@@ -729,6 +729,8 @@ def run(self):
 
             return self.format_string(f"""func_Lookup({inputs_string}, {op.name});""")
 
+        raise TypeError(f"{self.op.op_type} is not supported in View.run().")
+
     def render_alias(self, op, input_ops, output_ops):
         if len(input_ops) != 1:
             self.raise_invalid_args_exception(op, input_ops, output_ops)