After upgrading from v2026.3.24 to v2026.3.31, all HTTP requests to the gateway return 500 Internal Server Error, including the Control UI dashboard (/chat?session=main, /, /__openclaw__/canvas/, etc.). WebSocket connections continue to work normally. Other stages like control-ui-http are correctly guarded by controlUiEnabled, but the Slack stage has no such guard. When the Slack plugin is disabled (default) and @slack/web-api is not installed, the lazy module load inside handleSlackHttpRequest throws, which is caught by the outer catch block and returned as a generic 500 with no error logging: res.end("Internal Server Error"); 6. Observe: 500 Internal Server Error

• If a stage fails due to a missing optional dependency, it should log the error and continue to the next stage, not fail the entire request

TL;DR

Conditionally include the Slack HTTP stage in the request pipeline only when the Slack plugin is enabled to prevent the 500 Internal Server Error.

Guidance

• Verify that the Slack plugin is disabled by default and that the @slack/web-api package is not installed, which triggers the error.
• To fix the issue, modify the createGatewayHttpServer() function in src/gateway/server-http.ts to conditionally add the handleSlackHttpRequest stage based on the Slack plugin's enabled state.
• Consider adding error logging for the HTTP failure to improve diagnosability.
• As a temporary workaround, install the Slack peer dependencies manually using the provided command.

Example

const requestStages: GatewayHttpRequestStage[] = [
  { name: "hooks", run: () => handleHooksRequest(req, res) },
  // ...
  ...(controlUiEnabled ? [{ name: "control-ui-http", run: () => handleControlUiRequest(req, res) }] : []),
  ...(slackPluginEnabled ? [{ name: "slack", run: () => handleSlackHttpRequest(req, res) }] : []),
];

Notes

The provided workaround may not be a permanent solution, as it requires manual installation of dependencies. A more robust fix would involve modifying the code to conditionally include the Slack stage.

Recommendation

Apply the workaround by installing the Slack peer dependencies manually, as this provides a temporary solution to the issue. However, it is recommended to modify the code to conditionally include the Slack stage for a more permanent fix.