ObjectDisposedException while connecting ssh

sometimes I get an error while using ssh connection, it is the cause of crashed app, with the following log messages:

2019-09-16 10:04:22.710 OneLink.iOS[307:17928]
Unhandled Exception:
System.ObjectDisposedException: Safe handle has been closed
at System.Runtime.InteropServices.SafeHandle.DangerousAddRef (System.Boolean& success) [0x0001c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.14.0.114/src/Xamarin.iOS/mcs/class/corlib/System.Runtime.InteropServices/SafeHandle.cs:125
at System.Threading.NativeEventCalls.SetEvent (Microsoft.Win32.SafeHandles.SafeWaitHandle handle) [0x00002] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.14.0.114/src/Xamarin.iOS/mcs/class/corlib/System.Threading/NativeEventCalls.cs:61
at System.Threading.EventWaitHandle.Set () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.14.0.114/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/threading/eventwaithandle.cs:319
at Renci.SshNet.Abstractions.SocketAbstraction.ConnectCompleted (System.Object sender, System.Net.Sockets.SocketAsyncEventArgs e) [0x0000f] in :0

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I checked your codes, and I think that the problem in the function
public static Socket Connect(IPEndPoint remoteEndpoint, TimeSpan connectTimeout)
in file src/Renci.SshNet/Abstractions/SocketAbstraction.cs.
Maybe we must remove Completed callback function before disposing of ManualResetEvent.

Can you help me to check this issue?

Thanks so much!

Start in src/Renci.SshNet/Abstractions/SocketAbstraction.cs at Connect(IPEndPoint remoteEndpoint, TimeSpan connectTimeout). Trace the SocketAsyncEventArgs.Completed callback and the ManualResetEvent lifetime around timeout and disposal. Done means the reported ObjectDisposedException no longer occurs while connecting over SSH, including when the connection completes near disposal.