diff --git a/services/redis.py b/services/redis.py
index 3aa5f08..d33b6d5 100644
--- a/services/redis.py
+++ b/services/redis.py
@@ -11,7 +11,7 @@ class RedisCache:
 
     async def connect(self):
         self._redis = aredis.StrictRedis.from_url(self._uri, decode_responses=True)
-        response = await self._redis.execute('PING')
+        response = await self.execute('PING')
         print(f"[redis] PING response: {response}")
 
     async def disconnect(self):
@@ -24,8 +24,9 @@ class RedisCache:
         try:
             print("[redis] " + command + " " + " ".join(args))
             return await self._redis.execute_command(command, *args, **kwargs)
-        except Exception:
-            pass
+        except Exception as e:
+            print(f"[redis] error: {e}")
+            return None
 
     async def subscribe(self, *channels):
         if not self._redis: