tp6框架使用异常退出

----------------------- WORKERMAN -----------------------------
Workerman version:3.5.31 PHP version:7.3.4
------------------------ WORKERS -------------------------------
worker listen processes status
none websocket://0.0.0.0:2345 1 [ok]

[think\exception\ErrorException]
Undefined property: Workerman\Connection\TcpConnection::$uid

Worker process terminated

一会就提示这个了

<?php
declare (strict_types=1);

namespace app\worker;

use Exception;
use think\worker\Server; //worker服务
use Workerman\Lib\Timer; //心跳类库
define('HEARTBEAT_TIME', 15); //心跳间隔

class Worker extends Server
{
    protected $socket = 'websocket://0.0.0.0:2345'; //链接地址
    protected $uidConnections = array();

    /**
     * 收到用户消息
     * @param $connection
     * @param $data
     * @return bool
     */
    public function onMessage($connection, $data): bool
    {
        $arr = json_decode($data);

        if (empty($arr->type)){
            $connection->send(json_encode(["code" => 202, "msg" => '1']));
            return $connection->close();
        }
        if($arr->type === 'PING'){
            $connection->lastMessageTime = time();
            return $connection->send(json_encode(["type" => 'PONG']));
        }
        if ($arr->type === 'bind') {
            if (empty($arr->uid)) return $connection->send(json_encode(["code" => 202, "msg" => '2']));
            //用户UID绑定并判断是否绑定过
            if (!isset($connection->uid)) {
                $connection->uid = $arr->uid;
                $this->uidConnections[$connection->uid] = $connection;
                return $connection->send(json_encode(["code" => 200, "msg" => '链接成功', "data" => $connection->uid]));
            } else {
                return $connection->send(json_encode(["code" => 201, "msg" => '您已经绑定过了']));
            }
        } elseif ($arr->type === 'msg') {
            // 指定UID发送消息
            if (empty($arr->toUId) || empty($arr->content)) return $connection->send(json_encode(["code" => 202, "msg" => '3']));
            $this->sendMessageByUid($arr->toUId, $arr->content);
        }
        return true;
    }

    /**
     * 指定uid推送数据
     * @param $uid
     * @param $message
     * @return void
     */
    function sendMessageByUid($uid, $message)
    {
        if (isset($this->uidConnections[$uid])) {
            $connection = $this->uidConnections[$uid];
            $connection->send($message);
            //TODO 判断是否在线不在线则将消息存如MySQL  type状体为 0 当此用户在次链接时把所有消息在发送回去，并更新type字段为1
        }else{
            //TODO 当前发送用户没有绑定
        }
    }

    /**
     * 当连接建立时触发的回调函数
     * @param $connection
     */
    public function onConnect($connection)
    {

    }

    /**
     * 当连接断开时触发的回调函数
     * @param $connection
     */
    public function onClose($connection)
    {
        if(isset($connection->uid))
        {
            // 连接断开时删除映射
            unset($this->uidConnections[$connection->uid]);
        }
    }

    /**
     * 当客户端的连接上发生错误时触发
     * @param $connection
     * @param $code
     * @param $msg
     */
    public function onError($connection, $code, $msg)
    {
        echo "error $code $msg\n";
    }

    /**
     * 每个进程启动
     * @param $worker
     */
    public function onWorkerStart($worker)
    {
        Timer::add(10, function()use($worker){
            $time_now = time();
            foreach($worker->connections as $connection) {
                // 有可能该connection还没收到过消息，则lastMessageTime设置为当前时间
                if (empty($connection->lastMessageTime)) {
                    $connection->lastMessageTime = $time_now;
                    continue;
                }
                // 上次通讯时间间隔大于心跳间隔，则认为客户端已经下线，关闭连接
                if ($time_now - $connection->lastMessageTime > HEARTBEAT_TIME) {
                    //对下线的用户进行添加
                    echo ($connection->uid."已经离线".PHP_EOL);
                    $connection->close();
                }
            }
        });
    }
}