AI Agent does not respond properly to consecutive chat messages

[Luca_Park]

Describe the problem/error/question

I am experiencing an issue where my AI Agent does not properly respond to consecutive chat messages.

My workflow is:

When chat message received → Simple Memory → AI Agent → Respond to Chat
(Model: gemini-2.5-pro)

The first user message works correctly and I get a response in the chat UI.
However, when I send a follow-up message in the same chat session, the UI only shows:

Workflow executed successfully

and no AI response is displayed.

If I send the exact same message again, then the AI finally responds.
This pattern repeats continuously:

• 1st message → works

• 2nd message → only “Workflow executed successfully”

• 3rd message → response appears

• 4th message → only “Workflow executed successfully” again

It looks like the chat response is being dropped or delayed by one execution.

What should I check or change to fix this?

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What is the error message (if any)?

There is no explicit error.
The only message shown in the chat UI is:

Workflow executed successfully

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Please share your workflow

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Share the output returned by the last node

When the issue occurs, the Respond to Chat node does not display any message in the chat UI, even though the execution finishes successfully.

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Information on your n8n setup

• n8n version:

• Database (default: SQLite): Not used

• n8n EXECUTIONS_PROCESS setting (default: own, main): n/a (n8n Cloud)

• Running n8n via (Docker, npm, n8n cloud, desktop app): n8n Cloud

• Operating system: Windows

[mohamed3nan]

Hi @Luca_Park, welcome!

I don’t think you’ll need the “Respond to Chat” node here.

To simplify things, just try:

[Luca_Park]

Oh, so it works well. But if I do it this way, when the AI asks me a question in return, can I only see it as OUTPUT?

[mohamed3nan]

Yes, this is how it works without “Respond to Chat” node

[Luca_Park]

thank you so much!