diff --git a/src/dispatchers/pageDispatcher.ts b/src/dispatchers/pageDispatcher.ts
index eaa1914ee4..141fa4bfd4 100644
--- a/src/dispatchers/pageDispatcher.ts
+++ b/src/dispatchers/pageDispatcher.ts
@@ -79,6 +79,10 @@ export class PageDispatcher extends Dispatcher<Page, channels.PageInitializer, c
     page.on(Page.Events.Video, (artifact: Artifact) => this._dispatchEvent('video', { artifact: existingDispatcher<ArtifactDispatcher>(artifact) }));
     if (page._video)
       this._dispatchEvent('video', { artifact: existingDispatcher<ArtifactDispatcher>(page._video) });
+    // Ensure client knows about all frames.
+    const frames = page._frameManager.frames();
+    for (let i = 1; i < frames.length; i++)
+      this._onFrameAttached(frames[i]);
   }
 
   page(): Page {
diff --git a/tests/chromium/chromium.spec.ts b/tests/chromium/chromium.spec.ts
index f7b61149ed..9e48957b99 100644
--- a/tests/chromium/chromium.spec.ts
+++ b/tests/chromium/chromium.spec.ts
@@ -147,6 +147,28 @@ playwrightTest('should connect to an existing cdp session twice', async ({ brows
   }
 });
 
+playwrightTest('should connect to existing page with iframe and navigate', async ({ browserType, browserOptions, server }, testInfo) => {
+  const port = 9339 + testInfo.workerIndex;
+  const browserServer = await browserType.launch({
+    ...browserOptions,
+    args: ['--remote-debugging-port=' + port]
+  });
+  try {
+    {
+      const context1 = await browserServer.newContext();
+      const page = await context1.newPage();
+      await page.goto(server.PREFIX + '/frames/one-frame.html');
+    }
+    const cdpBrowser = await browserType.connectOverCDP(`http://localhost:${port}/`);
+    const contexts = cdpBrowser.contexts();
+    expect(contexts.length).toBe(1);
+    await contexts[0].pages()[0].goto(server.EMPTY_PAGE);
+    await cdpBrowser.close();
+  } finally {
+    await browserServer.close();
+  }
+});
+
 playwrightTest('should connect to existing service workers', async ({browserType, browserOptions, server}, testInfo) => {
   const port = 9339 + testInfo.workerIndex;
   const browserServer = await browserType.launch({