zed-industries/zed · error

workspace must exist

Error message

workspace must exist

What it means

Guard in AgentDiffPane::new asserting the pane is always constructed with a live workspace; at the call site the workspace is known to exist because the pane is only created from an open workspace window. Firing would mean a caller violated that invariant.

Source

Thrown at crates/agent_ui/src/agent_diff.rs:94

            let agent_diff = cx
                .new(|cx| AgentDiffPane::new(thread.clone(), workspace.weak_handle(), window, cx));
            workspace.add_item_to_center(Box::new(agent_diff.clone()), window, cx);
            agent_diff
        }
    }

    pub fn new(
        thread: Entity<AcpThread>,
        workspace: WeakEntity<Workspace>,
        window: &mut Window,
        cx: &mut Context<Self>,
    ) -> Self {
        let focus_handle = cx.focus_handle();
        let multibuffer = cx.new(|_| MultiBuffer::new(Capability::ReadWrite));

        let project = thread.read(cx).project().clone();
        let editor = cx.new(|cx| {
            let workspace_entity = workspace.upgrade().expect("workspace must exist");
            let diff_display_editor = SplittableEditor::new(
                EditorSettings::get_global(cx).diff_view_style,
                multibuffer.clone(),
                project.clone(),
                workspace_entity,
                window,
                cx,
            );
            diff_display_editor
                .set_diff_hunk_delegate(Some(agent_diff_delegate(&thread, workspace.clone())), cx);
            diff_display_editor.update_editors(cx, |editor, _cx| {
                editor.register_addon(AgentDiffAddon);
            });
            diff_display_editor
        });

        let action_log = thread.read(cx).action_log().clone();

View on GitHub (pinned to f4178619ac)

Solutions

1. Ensure AgentDiffPane is only constructed when a Workspace entity is available
2. Upgrade the WeakEntity<Workspace> to a strong handle before constructing the pane

When it happens

Trigger: Thrown at crates/agent_ui/src/agent_diff.rs:94 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of zed-industries/zed@f4178619ac (2026-08-20). Data as JSON: /api/errors/6ff62cf49b65d80e. Report an issue: GitHub.