rustdesk/rustdesk · error

No session with peer id {}

Error message

No session with peer id {}

What it means

Raised in the Flutter session-restart/start path when no session exists for the given peer id. The lookup by peer id fails, so instead of spawning a new io_loop for the session the function bails with this message.

Source

Thrown at src/flutter.rs:1395

    }

    if let Some(session) = sessions::get_session_by_session_id(session_id) {
        let is_first_ui_session = session.session_handlers.read().unwrap().len() == 1;
        if !is_connected && is_first_ui_session {
            log::info!(
                "Session {} start, use texture render: {}",
                id,
                session.use_texture_render.load(Ordering::Relaxed)
            );
            let session = (*session).clone();
            std::thread::spawn(move || {
                let round = session.connection_round_state.lock().unwrap().new_round();
                io_loop(session, round);
            });
        }
        Ok(())
    } else {
        bail!("No session with peer id {}", id)
    }
}

#[inline]
fn try_send_close_event(event_stream: &Option<StreamSink<EventToUI>>) {
    if let Some(stream) = &event_stream {
        stream.add(EventToUI::Event("close".to_owned()));
    }
}

#[cfg(not(target_os = "ios"))]
pub fn update_text_clipboard_required() {
    let is_required = sessions::get_sessions()
        .iter()
        .any(|s| s.is_default() && s.is_text_clipboard_required());
    #[cfg(target_os = "android")]
    let _ = scrap::android::ffi::call_clipboard_manager_enable_client_clipboard(is_required);
    Client::set_is_text_clipboard_required(is_required);

View on GitHub (pinned to 91c9fccbb0)

Solutions

1. Re-create the session (session_add) before requesting a restart
2. Verify the peer id used matches the id the session was registered under
3. Guard the restart call with a session-existence check on the client side

Example fix

// before
session_start(&peer_id)?;
// after
if sessions::get_session_by_peer_id(&peer_id).is_some() {
    session_start(&peer_id)?;
}

// confirm the session exists before requesting a restart
if sessions::get_session_by_peer_id(&peer_id).is_none() {
    // re-create the session instead of restarting
}

match session_restart(&peer_id) {
    Err(e) if e.to_string().starts_with("No session with peer id") => session_add(&peer_id).and_then(|_| session_restart(&peer_id)),
    other => other,
}

When it happens

Trigger: Calling session restart/start (which spawns the io_loop) with a peer id that has no registered session — e.g. the session was closed or was never added.

Common situations: Attempting to reconnect after the session was removed from the sessions map; caller uses the peer display id rather than the registered id; session closed on disconnect while a restart is still requested.

Understand the failure class

Background: "Not found" and "does not exist" errors: why "Task not found", "No such folder", and "Can't find" fire when a lookup comes back empty — this error's family across 14 libraries.

Related errors

• No session with peer id {}, session id: {}
• same session id is found with different conn type?
• same session id is found
• file handle not found
• failed to get general pasteboard

AI-assisted analysis of rustdesk/rustdesk@91c9fccbb0 (2026-09-10). Data as JSON: /api/errors/72d6bbbb8ec0f084. Report an issue: GitHub.