diff --git a/packages/http-client-python/generator/pygen/codegen/__init__.py b/packages/http-client-python/generator/pygen/codegen/__init__.py
index 074b5854c8..ce8368d417 100644
--- a/packages/http-client-python/generator/pygen/codegen/__init__.py
+++ b/packages/http-client-python/generator/pygen/codegen/__init__.py
@@ -245,7 +245,7 @@ def _validate_code_model_options(self) -> None:
     @staticmethod
     def sort_exceptions(yaml_data: Dict[str, Any]) -> None:
         for client in yaml_data["clients"]:
-            for group in client["operationGroups"]:
+            for group in client.get("operationGroups", []):
                 for operation in group["operations"]:
                     if not operation.get("exceptions"):
                         continue
@@ -262,7 +262,7 @@ def sort_exceptions(yaml_data: Dict[str, Any]) -> None:
     @staticmethod
     def remove_cloud_errors(yaml_data: Dict[str, Any]) -> None:
         for client in yaml_data["clients"]:
-            for group in client["operationGroups"]:
+            for group in client.get("operationGroups", []):
                 for operation in group["operations"]:
                     if not operation.get("exceptions"):
                         continue