openclaw - 💡(How to fix) Fix [Bug]: Control UI webchat showing duplicate assistant replies

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The Control UI webchat renders every assistant reply twice (once inline, once as a forwarded message). Confirmed persistent across hard-refreshes — not a cache issue. Stock config, no special webchat overrides. Likely a client-side dual-delivery bug in the control UI frontend.

Environment:

  • Channel: webchat (Control UI)
  • OpenClaw version: 2026.4.24
  • Config: no special webchat/delivery overrides

Root Cause

The Control UI webchat renders every assistant reply twice (once inline, once as a forwarded message). Confirmed persistent across hard-refreshes — not a cache issue. Stock config, no special webchat overrides. Likely a client-side dual-delivery bug in the control UI frontend.

Environment:

  • Channel: webchat (Control UI)
  • OpenClaw version: 2026.4.24
  • Config: no special webchat/delivery overrides
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Bug type

Behavior bug (incorrect output/state without crash)

Beta release blocker

No

Summary

The Control UI webchat renders every assistant reply twice (once inline, once as a forwarded message). Confirmed persistent across hard-refreshes — not a cache issue. Stock config, no special webchat overrides. Likely a client-side dual-delivery bug in the control UI frontend.

Environment:

  • Channel: webchat (Control UI)
  • OpenClaw version: 2026.4.24
  • Config: no special webchat/delivery overrides

Steps to reproduce

  1. Open OpenClaw Control UI webchat in browser at http://127.0.0.1:18790
  2. Send a message (e.g. "Hello")
  3. Observe the assistant's reply appearing twice — once inline and once as a forwarded/duplicate message below it

Expected behavior

one copy. Actual: duplicates always.

Likely client-side dual-delivery bug in the control UI frontend.

Actual behavior

The assistant reply is rendered twice — appearing as two separate messages in the chat thread. One copy is inline, the other is a forwarded/duplicate message immediately below it. This happens consistently, every single time.

OpenClaw version

2026.4.24

Operating system

Linux 6.17.0-1018-nvidia (arm64).

Install method

No response

Model

inference/qwen3.6:35b

Provider / routing chain

inference/qwen3.6:35b → inference.local (https://inference.local/v1, openai-completions API)

Additional provider/model setup details

No response

Logs, screenshots, and evidence

Impact and severity

No response

Additional information

No response

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FAQ

Expected behavior

one copy. Actual: duplicates always.

Likely client-side dual-delivery bug in the control UI frontend.

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