Session: Error while trying to free lock for ci_session

I've made a few change to my workaround:

replaced the "sleep(1)" with:

PHP Code:

$sleep_random = (rand(0,5)) * 100000;

usleep(500000+$sleep_random); 


and avoided to delete an unexistant key, replacing:

PHP Code:

if (isset($this->_redis, $this->_lock_key) && $this->_lock) 


with:

PHP Code:

if (isset($this->_redis, $this->_lock_key) && $this->_lock && $this->_redis->exists($this->_lock_key))