diff --git a/codegenerator/openapi/base.py b/codegenerator/openapi/base.py
index 7c2e336..8e065a5 100644
--- a/codegenerator/openapi/base.py
+++ b/codegenerator/openapi/base.py
@@ -768,14 +768,15 @@ class OpenStackServerSourceBase:
                 ),
             )
             for data, min_ver, max_ver in so:
-                self.process_query_parameters(
-                    openapi_spec,
-                    operation_spec,
-                    path_resource_names,
-                    data,
-                    min_ver,
-                    max_ver,
-                )
+                if data:
+                    self.process_query_parameters(
+                        openapi_spec,
+                        operation_spec,
+                        path_resource_names,
+                        data,
+                        min_ver,
+                        max_ver,
+                    )
         # if body_schemas or mode == "action":
         if method in ["PUT", "POST", "PATCH"]:
             self.process_body_parameters(
diff --git a/codegenerator/openapi/keystone.py b/codegenerator/openapi/keystone.py
index c838cdf..1df1573 100644
--- a/codegenerator/openapi/keystone.py
+++ b/codegenerator/openapi/keystone.py
@@ -407,14 +407,15 @@ class KeystoneGenerator(OpenStackServerSourceBase):
                 ),
             )
             for data, min_ver, max_ver in so:
-                self.process_query_parameters(
-                    openapi_spec,
-                    operation_spec,
-                    path_resource_names,
-                    data,
-                    min_ver,
-                    max_ver,
-                )
+                if data:
+                    self.process_query_parameters(
+                        openapi_spec,
+                        operation_spec,
+                        path_resource_names,
+                        data,
+                        min_ver,
+                        max_ver,
+                    )
 
         if method in ["PUT", "POST", "PATCH"]:
             self.process_body_parameters(