diff --git a/src/backend/langflow/services/cache/manager.py b/src/backend/langflow/services/cache/manager.py
index 9042757ae..843eb182e 100644
--- a/src/backend/langflow/services/cache/manager.py
+++ b/src/backend/langflow/services/cache/manager.py
@@ -292,7 +292,7 @@ class RedisCache(BaseCacheService, Service):
 
     def __contains__(self, key):
         """Check if the key is in the cache."""
-        return self._client.exists(key)
+        return False if key is None else self._client.exists(key)
 
     def __getitem__(self, key):
         """Retrieve an item from the cache using the square bracket notation."""