TypeError: Cannot add property selectedAnswer, object is not extensible

Getting object not extensible error for selectedAnswer

Object.values(atsInfo.firstLevel).forEach((subAtsInfo: any) => {
if (subatsInfo.questions) {
subAtsInfo.questions.forEach((ques: any) => {
const answer = data.question_answers?.[ques.id];
if (answer) {
if (ques.isOnlyBool) {
ques.isChecked = data.question_answers[ques.id] === 'yes' ? true : false;
} else {
var selectedItem = {
title: data.question_answers[ques.id],
quesId: ques.id,
};
ques.selectedAnswer = selectedItem;
}
}


I guess this is due to object being frozen or non extensibility

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