null check operator failure

[isoos]

Observed with grpc 3.0.0, appengine 0.13.0, not really sure what/where the culprit is...

Error: gRPC Error (code: 14, codeName: UNAVAILABLE, message: Error making call: Null check operator used on a null value, details: null, rawResponse: null)
    at _StreamController.addError (native)
    at ClientCall._terminateWithError (package:grpc/src/client/call.dart:219:18)
    at ClientCall._sendRequest (package:grpc/src/client/call.dart:275:7)
    at ClientCall.onConnectionReady.<fn> (package:grpc/src/client/call.dart:255:24)

[givip]

I've experienced the same error. It seems, that _transportConnection in Http2ClientConnection is null. Can it happen, when you call terminate on channel?

[dishankjindal1]

Why no one is closing the duplicate issues?

[dishankjindal1]

Is this has been fixed?

[mosuem]

@dishankjindal1 If you could add code to reproduce this error, that would be very helpful.

Closing in favor of #529.