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Support Questions / System.NullReferenceException

« on: October 07, 2021, 10:56:17 AM »

Hi guys,
after 3 years of using AdvancedHMI I'm getting an error hard to crack:

- windows 10, vs 2019, VB advancedHMI 3.99

Eroor:
System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=MfgControl.AdvancedHMI.Drivers
  StackTrace:
   at MfgControl.AdvancedHMI.Drivers.CIP.CIPforCLX.a(CLXAddress A_0, Int64 A_1, Int32 A_2)

FROM
EthernetIPforCLXCom.vb

Protected Overrides Sub OnComError(ByVal e As MfgControl.AdvancedHMI.Drivers.Common.PlcComEventArgs)
        'If m_SynchronizingObject IsNot Nothing AndAlso m_SynchronizingObject.InvokeRequired Then
        If m_synchronizationContext IsNot Nothing Then
            'Dim Parameters() As Object = {Me, e}
            'm_SynchronizingObject.BeginInvoke(errorsd, Parameters)
            m_synchronizationContext.Post(AddressOf ErrorReceivedSync, e)[/b]
        Else
            MyBase.OnComError(e)
        End If
        'End If

    End Sub

It happens when the PLC is not connected or the cable breaks.
With the PLC working it's ok