diff --git a/web/src/BrowserList.jsx b/web/src/BrowserList.jsx
index 04024ea..0e8d58d 100644
--- a/web/src/BrowserList.jsx
+++ b/web/src/BrowserList.jsx
@@ -30,7 +30,7 @@ const statusLabels = {
 }
 
 function Status({ state }) {
-  const label = statusLabels[state]
+  const label = Object.hasOwn(statusLabels, state) ? statusLabels[state] : undefined
   const color = state === 'running' ? 'success.main' : state === 'exited' ? 'warning.main' : 'text.secondary'
   return <Box sx={{ display: 'inline-flex', alignItems: 'center', gap: 1, color, fontWeight: 650 }}><Box sx={{ width: 8, height: 8, borderRadius: '50%', bgcolor: 'currentColor' }} /><Box><Typography component="span" fontWeight="inherit">{label || '未知状态'}</Typography>{label ? null : <Typography component="span" variant="caption" color="text.secondary" sx={{ display: 'block' }}>{state}</Typography>}</Box></Box>
 }
diff --git a/web/src/BrowserList.test.jsx b/web/src/BrowserList.test.jsx
index abfafed..77f0bb8 100644
--- a/web/src/BrowserList.test.jsx
+++ b/web/src/BrowserList.test.jsx
@@ -46,6 +46,14 @@ describe('BrowserList', () => {
     expect(rawStates[0].className).toContain('MuiTypography-caption')
   })
 
+  it.each(['constructor', 'toString', '__proto__'])('treats prototype key %s as an unknown state', async (state) => {
+    const protoRuntime = { ...runtimes[0], state }
+    render(<CoreAdminContext dataProvider={provider({ getList: vi.fn().mockResolvedValue({ data: [protoRuntime], total: 1 }) })}><BrowserList /></CoreAdminContext>)
+
+    expect(await screen.findAllByText('未知状态')).toHaveLength(2)
+    expect(screen.getAllByText(state)).toHaveLength(2)
+  })
+
   it('disables invalid lifecycle actions and sends explicit domain actions', async () => {
     const dataProvider = provider()
     render(<CoreAdminContext dataProvider={dataProvider}><BrowserList /></CoreAdminContext>)
diff --git a/web/tests/responsive.e2e.js b/web/tests/responsive.e2e.js
index 4035319..271437b 100644
--- a/web/tests/responsive.e2e.js
+++ b/web/tests/responsive.e2e.js
@@ -1,5 +1,14 @@
 import { expect, test } from '@playwright/test'
 
+const runtime = {
+  id: 'container-a',
+  name: 'account-a',
+  state: 'running',
+  status: 'Up',
+  profile: 'creatorhub-profile-account-a',
+  endpoint: 'http://account-a:9222',
+}
+
 test('keeps the create form inside a 900px viewport', async ({ page }) => {
   await page.route('**/api/browsers', route => route.fulfill({ json: [] }))
   await page.setViewportSize({ width: 900, height: 800 })
@@ -13,3 +22,17 @@ test('keeps the create form inside a 900px viewport', async ({ page }) => {
   expect(box).not.toBeNull()
   expect(box.x + box.width).toBeLessThanOrEqual(900)
 })
+
+test('shows the CDP endpoint only in the active branch at 900px and 599px', async ({ page }) => {
+  await page.route('**/api/browsers', route => route.fulfill({ json: [runtime] }))
+  const endpoint = page.getByText('http://account-a:9222')
+
+  await page.setViewportSize({ width: 900, height: 800 })
+  await page.goto('/')
+  await expect(page.getByRole('cell', { name: 'http://account-a:9222' })).toBeVisible()
+  await expect(endpoint.filter({ visible: true })).toHaveCount(1)
+
+  await page.setViewportSize({ width: 599, height: 800 })
+  await expect(page.getByRole('cell', { name: 'http://account-a:9222' })).toBeHidden()
+  await expect(endpoint.filter({ visible: true })).toHaveCount(1)
+})