PHP Fatal error:  Uncaught exception 'Exception' with message 'You can't send(NULL) to client, you need to convert it to a string. ' in /data/socket.io/vendor/workerman/workerman/Protocols/Websocket.php:236
Stack trace:
#0 /data/socket.io/vendor/workerman/workerman/Connection/TcpConnection.php(336): Workerman\Protocols\Websocket::encode(NULL, Object(Workerman\Connection\TcpConnection))
#1 /data/socket.io/vendor/workerman/workerman/Protocols/Websocket.php(167): Workerman\Connection\TcpConnection->send(NULL)
#2 /data/socket.io/vendor/workerman/workerman/Connection/TcpConnection.php(608): Workerman\Protocols\Websocket::input('\x89\x80\x0E\xBB[O', Object(Workerman\Connection\TcpConnection))
#3 : Workerman\Connection\TcpConnection->baseRead(Resource id #59)
#4 /data/socket.io/vendor/react/event-loop/src/StreamSelectLoop.php(238): call_user_func(Array, Resource id #59)
#5 /data/socket.io/vendor/react/event-loop/src/StreamSelectLoop.php(205): React\EventLoop\StreamSelectLoop->waitForStreamActivity(10028784)
#6 /dat in /data/socket.io/vendor/workerman/workerman/Protocols/Websocket.php on line 236

安卓客戶端有使用ping 但是ping沒有附加任何參數(shù)，也就是沒有發(fā){"type":"ping"}，每當(dāng)客戶端要主動(dòng)發(fā)ping的時(shí)候就會出現(xiàn)在這個(gè)錯(cuò)誤。我也不知道到底哪里錯(cuò)了。