How to solve a problem with Array.sort Cannot assign to read only property '0' of object

In my React App I’m getting an error in the sort functionality

Uncaught TypeError: Cannot assign to read only property '0' of object '[object Array]'

I have no idea what the problem is and the functionality is this:

const preparedSites = useMemo(
      () =>
          .map(elm => {
            const arr = [
            if (nearestSites.length)
                nearestSites.find(s => s.closestSiteId === elm.siteId).distance,
            return arr;
          .sort((a, b) => a[6] - b[6]),
      [sites, site, nearestSites],

The error happening on the .sort part and the ´sortSiteSelection´ is as follow

const nameCompare = (x, y) =>;
const cityCompare = (x, y) =>;
const compareCountry = s => (x, y) => {
  if (!s) return 0;

  if (x.countryCode === s.countryCode && y.countryCode === s.countryCode)
    return 0;
  else if (x.countryCode === s.countryCode) return -1;
  else if (y.countryCode === s.countryCode) return 1;
  else return x.countryCode.localeCompare(y.countryCode);

export const sortSiteSelection = selectedSite => {
  if (!selectedSite) {
    console.log('NULL FROM SORT SITE');
    return () => 0;
  pipeSort(compareCountry(selectedSite), nameCompare, cityCompare);

The OBJ of site is just



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