macでpuppetteerを動かしていてスクリーンセーバーが動くと出る？エラー

スクリーンセーバーが動くと下記エラーが出てしまう模様。
回避策は？？




UnhandledPromiseRejectionWarning: Error: Protocol error (Runtime.evaluate): Execution context was destroyed. undefined
    at Promise (/Users/***/node_modules/puppeteer/lib/Connection.js:198:56)
    at new Promise ()
    at CDPSession.send (/Users/***/node_modules/puppeteer/lib/Connection.js:197:12)
    at Touchscreen.tap (/Users/***/node_modules/puppeteer/lib/Input.js:287:24)
    at ElementHandle.tap (/Users/***/node_modules/puppeteer/lib/ElementHandle.js:107:34)
    at
    at process._tickCallback (internal/process/next_tick.js:118:7)