[OnTurnError] unhandled error : The CancellationTokenSource has been disposed.

[jagdish-kumawat]

I am getting this error when user stops the chat and comes after some time to continue the conversation. The bot stops responding until I restart the app service. I am using teams channel. I am on latest version of bot framework c#.

This only happens if they are in repeated child dialog. I have a child dialog handling Q&A and I only exit that child dialog when user says exit, cancel, home etc.

Here is the stack trace -

Microsoft.Bot.Builder.Integration.AspNet.Core.IBotFrameworkHttpAdapter[0] 2024-04-16T08:26:14.1498802Z [OnTurnError] unhandled error : The CancellationTokenSource has been disposed. 2024-04-16T08:26:14.1510465Z System.ObjectDisposedException: The CancellationTokenSource has been disposed. 2024-04-16T08:26:14.1685928Z at Microsoft.Bot.Builder.ShowTypingMiddleware.FinishTypingTaskAsync(ITurnContext turnContext) 2024-04-16T08:26:14.1701899Z at Microsoft.Bot.Builder.ShowTypingMiddleware.ProcessTypingAsync(ITurnContext turnContext) 2024-04-16T08:26:14.1976692Z at Microsoft.Bot.Builder.ShowTypingMiddleware.OnTurnAsync(ITurnContext turnContext, NextDelegate next, CancellationToken cancellationToken) 2024-04-16T08:26:14.2164601Z at Microsoft.Bot.Builder.Teams.TeamsSSOTokenExchangeMiddleware.OnTurnAsync(ITurnContext turnContext, NextDelegate next, CancellationToken cancellationToken) 2024-04-16T08:26:14.2258972Z at Microsoft.Bot.Builder.MiddlewareSet.ReceiveActivityWithStatusAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken) 2024-04-16T08:26:14.2268689Z at Microsoft.Bot.Builder.BotAdapter.RunPipelineAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken)

[dmvtech]

@jagdish-kumawat

• Do you have a minimal repro bot that can exhibit the issue?
• How long is the delay ("after some time")?
• Does it just happen on Teams only, or other channels as well?
• Is this using the legacy QnA or the newer CQA?

[tracyboehrer]

By any chance is the TurnContext being cached and used after the turn is over? The TurnContext is only valid during the current turn and is subsequently disposed.

[dmvtech]

Closing due to lack of response. If you have additional information that will help us troubleshoot, please let us know and we will reopen and continue.