zed-industries/zed · error

no adapter running to send request: {request:?}

Error message

no adapter running to send request: {request:?}

What it means

request_dap tried to send a DAP request over the client connection, but the adapter is not running (connection absent or already closed). The session state no longer has a live debug adapter to receive the request; typically the adapter crashed or the session was shutting down.

Source

Thrown at crates/project/src/debugger/session.rs:589

        let request_clone = request.clone();
        let connection = self.client.clone();
        self.executor.spawn(async move {
            let args = request_clone.to_dap();
            let response = connection.request::<R::DapRequest>(args).await?;
            request.response_from_dap(response)
        })
    }
}

impl SessionState {
    pub(super) fn request_dap<R: LocalDapCommand>(&self, request: R) -> Task<Result<R::Response>>
    where
        <R::DapRequest as dap::requests::Request>::Response: 'static,
        <R::DapRequest as dap::requests::Request>::Arguments: 'static + Send,
    {
        match self {
            SessionState::Running(debug_adapter_client) => debug_adapter_client.request(request),
            SessionState::Booting(_) => Task::ready(Err(anyhow!(
                "no adapter running to send request: {request:?}"
            ))),
        }
    }

    /// Did this debug session stop at least once?
    pub(crate) fn has_ever_stopped(&self) -> bool {
        match self {
            SessionState::Booting(_) => false,
            SessionState::Running(running_mode) => running_mode.has_ever_stopped,
        }
    }

    fn stopped(&mut self) {
        if let SessionState::Running(running) = self {
            running.has_ever_stopped = true;
        }
    }

View on GitHub (pinned to 9d272b0363)

Solutions

1. Restart the debug session to relaunch the adapter
2. Check the adapter's stderr/console output for a crash reason before the request
3. Guard UI actions that issue DAP requests once the session enters a stopping state

When it happens

Trigger: Thrown at crates/project/src/debugger/session.rs:589 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@9d272b0363 (2026-08-20). Data as JSON: /api/errors/deddd7ad7696b7da. Report an issue: GitHub.