Undefined variable in cache redis

[b1tc0re]

Variable $value is undefined in cache redis.

Maybe you still need to check it like this

if  (! isset($data['__ci_type'], $data['__ci_value']) || ($data['__ci_value'] === FALSE && $this->_redis->sIsMember('_ci_redis_serialized', $key))  )
{
            return null;
}