I think I have the same problem, same scenario and this is my error:
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
en Plutonium.Updater.Core.HTTP.<GetJsonAsync>d__31.MoveNext()
Crash ID: 8ae2d94c50594241a8f65033a17d1406
undefined