after I enter the username and hit start quiz it returns process is not defined, it was at first returning only this {}.

Hi Daily Tuition

Thanks for great video. I try to coding follow your instruction video but stuck at chapter storevalue (time: 1:16:11) when add question mark (?) to questions. React throw error
Failed to compile

./src/components/Questions.js 64:15
Module parse failed: Unexpected token (64:15)
You may need an appropriate loader to handle this file type.
|       columnNumber: 7
|     }
>   }, questions?.question), /*#__PURE__*/React.createElement("ul", {
|     key: questions?.id,
|     __self: this,

This error occurred during the build time and cannot be dismissed.

I test with console.log with questions, trace and everything is ok.

Can you (or anyone else) give me solutions for this?
Thanks