microsoft/playwright · error · Error

Pending client connection closed

Error message

Pending client connection closed

What it means

Error "Pending client connection closed" thrown in microsoft/playwright.

Source

Thrown at packages/extension/src/background.ts:105

        } catch (error: any) {
          sendResponse({ success: false, error: error.message });
        }
        return true;
      case 'keepalive':
        // Connect page pings us every ~20s so receiving this message resets
        // the MV3 service worker idle timer and keeps the relay WebSocket alive.
        return false;
    }
  }

  private async _connectTab(selectorTabId: number, tab: chrome.tabs.Tab & { id: number }, clientName: string | undefined): Promise<void> {
    try {
      await this._cleanupPromise;
      this._disconnect('Another connection is requested');

      const connection = await this._pendingConnections.take(selectorTabId);
      if (!connection)
        throw new Error('Pending client connection closed');

      const group = new ConnectedTabGroup(connection, tab);
      group.onclose = () => {
        if (this._activeGroup === group) {
          this._activeGroup = undefined;
          this._activeClientName = undefined;
        }
      };
      this._activeGroup = group;
      this._activeClientName = clientName;

      await Promise.all([
        chrome.tabs.update(tab.id, { active: true }),
        chrome.windows.update(tab.windowId, { focused: true }),
      ]).catch(() => {});

      if (tab.id !== selectorTabId)
        await chrome.tabs.remove(selectorTabId).catch(() => {});

View on GitHub (pinned to c8fc3bf8d3)

When it happens

Trigger: Thrown at packages/extension/src/background.ts:105 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Connection failures: ECONNREFUSED, ECONNRESET, and friends — why connections get refused, reset, or dropped.

AI-assisted analysis of microsoft/playwright@c8fc3bf8d3 (2026-08-12). Data as JSON: /api/errors/b7e12bb102d40cbe. Report an issue: GitHub.