diff --git a/litellm/_redis_credential_provider.py b/litellm/_redis_credential_provider.py
index 4d728ef21b6..4441d318373 100644
--- a/litellm/_redis_credential_provider.py
+++ b/litellm/_redis_credential_provider.py
@@ -4,7 +4,7 @@ import asyncio
 import threading
 import time
 from collections.abc import Callable
-from typing import TYPE_CHECKING, Any, Final, Protocol, cast
+from typing import TYPE_CHECKING, Any, Final, Protocol
 from urllib.parse import quote
 
 from redis.credentials import CredentialProvider
@@ -185,7 +185,10 @@ class ElastiCacheIAMCredentialProvider(CredentialProvider):
             self._region,
             expires=self._token_lifetime_seconds,
         ).add_auth(request)
-        return self._user_name, cast(str, request.url).removeprefix("https://")
+        signed_url: Final = request.url
+        if signed_url is None:
+            raise RuntimeError("Unable to generate AWS ElastiCache IAM credentials")
+        return self._user_name, signed_url.removeprefix("https://")
 
     def get_credentials(self) -> tuple[str, str]:
         return self._get_credentials()