diff --git a/esmerald/transformers/signature.py b/esmerald/transformers/signature.py
index 6cd18122..865ab02d 100644
--- a/esmerald/transformers/signature.py
+++ b/esmerald/transformers/signature.py
@@ -178,9 +178,7 @@ def encode_value(encoder: "Encoder", annotation: Any, value: Any) -> Any:
                 encoder_info: Dict[str, "Encoder"] = cls.encoders[key]  # type: ignore
                 encoder: "Encoder" = encoder_info["encoder"]
                 annotation = encoder_info["annotation"]
-                kwargs[key] = (
-                    encode_value(encoder, annotation, value) if value is not None else value
-                )
+                kwargs[key] = encode_value(encoder, annotation, value)
 
         return kwargs