diff --git a/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/__tests__/index.spec.tsx b/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/__tests__/index.spec.tsx
index e3fba27cf2..c282706706 100644
--- a/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/__tests__/index.spec.tsx
+++ b/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/__tests__/index.spec.tsx
@@ -149,6 +149,30 @@ describe('ShortcutsPopupPlugin', () => {
     })
   })
 
+  it('does not close on mousedown inside a Base UI portal overlay', async () => {
+    render(<MinimalEditor />)
+    const ce = screen.getByTestId(CONTENT_EDITABLE_ID)
+    ce.focus()
+
+    fireEvent.keyDown(document, { key: '/', ctrlKey: true })
+    expect(await screen.findByText(SHORTCUTS_EMPTY_CONTENT)).toBeInTheDocument()
+
+    const portal = document.createElement('div')
+    portal.setAttribute('data-base-ui-portal', '')
+    const portalChild = document.createElement('button')
+    portalChild.textContent = 'portal-child'
+    portal.appendChild(portalChild)
+    document.body.appendChild(portal)
+
+    fireEvent.mouseDown(portalChild)
+
+    await waitFor(() => {
+      expect(screen.getByText(SHORTCUTS_EMPTY_CONTENT)).toBeInTheDocument()
+    })
+
+    portal.remove()
+  })
+
   // ─── Container / portal ───
   it('portals into provided container when container is set', async () => {
     render(<MinimalEditor withContainer />)
diff --git a/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/index.tsx b/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/index.tsx
index 56b34b96e3..e3bee154d8 100644
--- a/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/index.tsx
+++ b/web/app/components/base/prompt-editor/plugins/shortcuts-popup-plugin/index.tsx
@@ -273,6 +273,9 @@ export default function ShortcutsPopupPlugin({
       /* v8 ignore next 2 -- outside-click listener can race with ref cleanup during close/unmount; null-ref path is a safety guard. @preserve */
       if (!portalRef.current)
         return
+      const target = e.target as HTMLElement | null
+      if (target?.closest('[data-base-ui-portal]'))
+        return
       if (!portalRef.current.contains(e.target as Node))
         closePortal()
     }