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diff --git a/litellm/proxy/guardrails/guardrail_hooks/cato_networks/cato_networks.py b/litellm/proxy/guardrails/guardrail_hooks/cato_networks/cato_networks.py
index 3d61eec4fff..b6a682c2e73 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/cato_networks/cato_networks.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/cato_networks/cato_networks.py
@@ -205,9 +205,11 @@ class CatoNetworksGuardrail(CustomGuardrail):
         redacted_chat = res.get("redacted_chat", None)
 
         if action_type and action_type == "anonymize_action" and redacted_chat:
-            return {
-                "redacted_output": redacted_chat["all_redacted_messages"][-1]["content"]
-            }
+            all_redacted = redacted_chat.get("all_redacted_messages") or []
+            if all_redacted:
+                return {
+                    "redacted_output": all_redacted[-1]["content"]
+                }
         return {"redacted_output": output}
 
     def _handle_block_action_on_output(
diff --git a/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_cato_networks.py b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_cato_networks.py
index 80d0fac3ac1..3adf3e76676 100644
--- a/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_cato_networks.py
+++ b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_cato_networks.py
@@ -703,6 +703,39 @@ async def test_post_call_success_hook_anonymize_action_applies_empty_redacted_ou
     assert result.choices[0].message.content == ""
 
 
+@pytest.mark.asyncio
+async def test_post_call_success_hook_anonymize_action_empty_redacted_messages_keeps_content():
+    guard = _make_guardrail()
+    request_data = {"messages": [{"role": "user", "content": "hi"}]}
+    anonymize_response = _make_response(
+        {
+            "analysis_result": {"policy_drill_down": {"PII": {}}},
+            "required_action": {"action_type": "anonymize_action", "policy_name": "PII"},
+            "redacted_chat": {"all_redacted_messages": []},
+        }
+    )
+    llm_response = ModelResponse(
+        choices=[
+            {
+                "finish_reason": "stop",
+                "index": 0,
+                "message": {"content": "secret PII", "role": "assistant"},
+            }
+        ]
+    )
+    with patch(
+        "litellm.llms.custom_httpx.http_handler.AsyncHTTPHandler.post",
+        return_value=anonymize_response,
+    ):
+        result = await guard.async_post_call_success_hook(
+            data=request_data,
+            response=llm_response,
+            user_api_key_dict=UserAPIKeyAuth(),
+        )
+    assert isinstance(result, ModelResponse)
+    assert result.choices[0].message.content == "secret PII"
+
+
 @pytest.mark.asyncio
 async def test_post_call_success_hook_no_action_keeps_content():
     guard = _make_guardrail()