Array and string offset access syntax with curly braces is deprecated

No hurry, but in a future version probably good to take account of

PHP Deprecated: Array and string offset access syntax with curly braces is deprecated in /var/www/vhosts/xyz/web/wp-content/uploads/civicrm/ext/ca.bidon.reporterror/reporterror.civix.php on line 246

cheers, RIchard