Showing "Error in message stream" in ChatGPT Apps SDK Development App

Updates: fixed on 20 Nov, thanks to the OpenAI team.


Hi, the ChatGPT App was working early today, but now always shows “Error in message stream” message with a retry button.

Console log:

Failed to load resource: the server responded with a status of 500 ()
k4027n9ylcc9lece.js:31 Uncaught (in promise) RequestError: Internal Server Error
    at Zj (k4027n9ylcc9lece.js:31:79771)
    at async k8.fetch (k4027n9ylcc9lece.js:31:80071)

opening https://chatgpt.com/backend-api/conversation/implicit_message_feedback and get “{“detail”:“Invalid conversation implicit_message_feedback”}”.

Not sure this issue is happening only to me? or someone else.

Thanks in advance for checking it.

Jake

21 Likes

I am getting an “Error in message stream” issue when trying to invoke a custom connector using the Apps SDK in developer mode. It does not appear to be the same issue you are seeing but I thought I would at least mention this for you and others as the same error is occurring.

Mine was working yesterday. I hadn’t tested it today until recently and I also haven’t changed any code so mine should be working as well.

8 Likes

Commenting on this as well to bump this! Thought I was going crazy for a bit. Same exact issue. Was working perfectly fine 3 hours ago. Now 1/10 requests will work. Anything trying to render widgets will result in error in stream

2 Likes

I am getting the same issue

1 Like

I’m getting the same error. No prompts are working with our custom MCP. It always shows this error: ‘Error in message stream.’ Can anyone from ChatGPT assist with this problem?

2 Likes

I’m getting the same error. It was working perfectly yesterday, and I haven’t changed any code, but now it’s not working.

1 Like

I’m getting the same problem, though MCP tool calls to existing ChatGPT apps such as Booking.com are working fine.

I am encountering the same issue as well

I have the same issue, no code changed, worked perfectly yesterday. I am running my MCP over sse… I tried adding other MCP servers to see if it would generate the same error. Stripe worked fine but Cloudflare had the same error.

Yes same issue since morning. I saw they added oauth client id and secret optional params while adding custom connectors . and since that update it started breaking

We’re experiencing the same error

any MCP in development with or without widgets since 18 Nov 2025 at 22:00 UTC

Seeing the same error, pretty sure it’s a new bug on ChatGPT seeing all these messages today. Would love to have a fix deployed.

1 Like

Experiencing same issue with Apps SDK since morning.

Would be great if Open ai would add gpt apps connectivity test cases to each new deployment. Even a simple Hello World app test would suffice. Something of this sort happens multiple times per week and it’s difficult to meet tight deadlines. Demos get pushed back, etc. Frustrating. Reporting the same issue here.

Reporting the same issue here. :frowning:

Same issue here since yesterday

Facing the same issue with a remote MCP server. No code change deployed, nor any widgets changed, but broken since IST morning today.

Can a fix for this issue be expedited?

Seeing the same issue (no code changed on my side)

No code changes. It was working yesterday, and today it stopped.