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审查页面的console显示错误内如下

Error in event handler for runtime.onMessage: TypeError: Cannot read property 'join' of undefined

    at Object.getPageLang (chrome-extension://hlppekcioiicbfafmmgikkdkljnjpiao/content.js:1:8920)

    at chrome-extension://hlppekcioiicbfafmmgikkdkljnjpiao/content.js:8:46945

小白一路看课程到此，不能止步于此啊，求大神解答