diff --git a/litellm/proxy/proxy_server.py b/litellm/proxy/proxy_server.py
index 77d96c48f4..55518141d5 100644
--- a/litellm/proxy/proxy_server.py
+++ b/litellm/proxy/proxy_server.py
@@ -675,7 +675,7 @@ class ProxyConfig:
 
                     # users can pass os.environ/ variables on the proxy - we should read them from the env
                     for key, value in cache_params.items():
-                        if value.startswith("os.environ/"):
+                        if type(value) is str and value.startswith("os.environ/"):
                             cache_params[key] = litellm.get_secret(value)
 
                     ## to pass a complete url, or set ssl=True, etc. just set it as `os.environ[REDIS_URL] = <your-redis-url>`, _redis.py checks for REDIS specific environment variables