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https://issues.apache.org/jira/browse/TINKERPOP-2192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17039801#comment-17039801
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Dzmitry.Lahoda commented on TINKERPOP-2192:
-------------------------------------------
[https://github.com/apache/tinkerpop/pull/1250]
> Gremlin.Net.Driver.Connection.Parse throws a NullReferenceException
> -------------------------------------------------------------------
>
> Key: TINKERPOP-2192
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2192
> Project: TinkerPop
> Issue Type: Bug
> Components: dotnet
> Affects Versions: 3.4.1
> Reporter: Florian Hockmann
> Priority: Minor
>
> The Parse method has only three objects on which we call methods of which two
> are {{readonly}}. So the problem is most likely in the error handling:
> {code}
> if (_callbackByRequestId.TryRemove(receivedMsg.RequestId, out var
> responseHandler))
> {
> responseHandler.HandleFailure(e);
> }
> {code}
> Here, {{responseHandler}} can be null if the callback handler for that
> request id was not found. So we just need a null check. (We can't notify
> anyone about a failure any way in this case.)
> Stack trace:
> {code}
> System.NullReferenceException: Object reference not set to an instance of an
> object.
> at Gremlin.Net.Driver.Connection.Parse(Byte[] received)
> at Gremlin.Net.Driver.Connection.ReceiveMessagesAsync()
> at Gremlin.Net.Driver.ProxyConnection.SubmitAsync[T](RequestMessage
> requestMessage)
> at Gremlin.Net.Driver.GremlinClient.SubmitAsync[T](RequestMessage
> requestMessage)
> at
> Gremlin.Net.Driver.Remote.DriverRemoteConnection.SubmitBytecodeAsync(Guid
> requestid, Bytecode bytecode)
> at
> Gremlin.Net.Driver.Remote.DriverRemoteConnection.SubmitAsync[S,E](Bytecode
> bytecode)
> at Gremlin.Net.Process.Remote.RemoteStrategy.ApplyAsync[S,E](ITraversal`2
> traversal)
> at Gremlin.Net.Process.Traversal.DefaultTraversal`2.ApplyStrategiesAsync()
> at
> Gremlin.Net.Process.Traversal.DefaultTraversal`2.Promise[TReturn](Func`2
> callback)
> {code}
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