diff --git a/flytekit/types/numpy/ndarray.py b/flytekit/types/numpy/ndarray.py
index cb1cf2a900..b4f67b94f1 100644
--- a/flytekit/types/numpy/ndarray.py
+++ b/flytekit/types/numpy/ndarray.py
@@ -52,7 +52,7 @@ def to_python_value(self, ctx: FlyteContext, lv: Literal, expected_python_type:
         try:
             uri = lv.scalar.blob.uri
         except AttributeError:
-            TypeTransformerFailedError(f"Cannot convert from {lv} to {expected_python_type}")
+            raise TypeTransformerFailedError(f"Cannot convert from {lv} to {expected_python_type}")
 
         local_path = ctx.file_access.get_random_local_path()
         ctx.file_access.get_data(uri, local_path, is_multipart=False)