diff --git a/gateway/integrations/guardrails.py b/gateway/integrations/guardrails.py
index 410af0c..0f95fbe 100644
--- a/gateway/integrations/guardrails.py
+++ b/gateway/integrations/guardrails.py
@@ -365,7 +365,7 @@ async def check_guardrails(
                 json={
                     "messages": messages,
                     "policies": [g.content for g in guardrails],
-                    "parameters": context.guardrails_parameters,
+                    "parameters": context.guardrails_parameters or {}
                 },
                 headers={
                     "Authorization": context.get_guardrailing_authorization(),