diff --git a/dune_client/api/table.py b/dune_client/api/table.py
index 822735f..239d0fc 100644
--- a/dune_client/api/table.py
+++ b/dune_client/api/table.py
@@ -103,7 +103,10 @@ def insert_table(
             headers={"Content-Type": content_type},
             data=data,
         )
-        return InsertTableResult.from_dict(result_json)
+        try:
+            return InsertTableResult.from_dict(result_json)
+        except KeyError as err:
+            raise DuneError(result_json, "ResultsResponse", err) from err
 
     def delete_table(self, namespace: str, table_name: str) -> DeleteTableResult:
         """
diff --git a/dune_client/models.py b/dune_client/models.py
index 2389960..270288f 100644
--- a/dune_client/models.py
+++ b/dune_client/models.py
@@ -375,6 +375,7 @@ class InsertTableResult(DataClassJsonMixin):
     """
 
     rows_written: int
+    bytes_written: int
 
 
 @dataclass