Error in event handler for runtime.onMessage: TypeError: Cannot read property 'classList' of null
at updateTranscript (chrome-extension://ciabocebgmaodclhcngdonkbljlfclcc/transcript.js:80:47)
at handleMessage (chrome-extension://ciabocebgmaodclhcngdonkbljlfclcc/transcript.js:117:9)
at chrome-extension://ciabocebgmaodclhcngdonkbljlfclcc/browser-polyfill.min.js:1:5888
Appears this error: