[BUG]ModbusClinet.ReadHoldingRegisters Throw NullReferenceException(在我的程序具有重连功能时引发的异常)

[jkh404]

上面的图片是Visual Studio2019 Debug 调试运行时抛出的异常。出现的位置是EasyModbusTCP.NET项目的ModbusClient.cs的ReadHoldingRegisters 方法
注意：这个 BUG是偶尔发生的，按照以下说明操作可以大概率重现。
情景重现：
我的程序是具有掉线重连功能的，每隔一秒会检查是否断开连接，如果断开连接则调用 Connect() 重新连接。

当我启动我的程序，然后再立刻启动ModBus Tcp Server 监听端口，最后抛出了异常。

en:
Visual Studio2019 Debug debuts an exception thrown at runtime. The location where this occurs is the ReadHoldingRegisters method of the modBusClient. cs of the EasyModbusTCP.NET project
Note:This bug happens occasionally.Follow the instructions below to have a high probability of recurrence
Re-enactment:
My program is a disconnected reconnect function, every second will check whether to disconnect, if disconnected call Connect() to reconnect.
When I started my program and then immediately started ModBus Tcp Server listening port, finally threw an exception.

[jkh404]

我用的版本是5.6
en:
I'm using version 5.6