diff --git a/api_commons/dto.py b/api_commons/dto.py
index 6204dbb..b5071b7 100644
--- a/api_commons/dto.py
+++ b/api_commons/dto.py
@@ -95,7 +95,7 @@ def to_dict(self):
         serialized_payload = self.payload
         if isinstance(self.payload, BaseDto):
             serialized_payload = self.payload.to_representation(self.payload)
-        if isinstance(self.payload, Iterable):
+        elif isinstance(self.payload, Iterable):
             serialized_payload = list([(p.to_representation(p) if isinstance(p, BaseDto) else p) for p in self.payload])
         return {
             "payload": serialized_payload,