Warning (2) : Attempt to read property "id" on null [in /var/www/vhosts/canarianweekly.com/httpdocs/src/Controller/ArticlesController.php, line 105]
Warning (512) : Unable to emit headers. Headers sent in file=/var/www/vhosts/canarianweekly.com/httpdocs/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php line=37 [in /var/www/vhosts/canarianweekly.com/httpdocs/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 71]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/vhosts/canarianweekly.com/httpdocs/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /var/www/vhosts/canarianweekly.com/httpdocs/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 164]
Warning (2) : Cannot modify header information - headers already sent by (output started at /var/www/vhosts/canarianweekly.com/httpdocs/vendor/cakephp/cakephp/src/Error/Renderer/HtmlErrorRenderer.php:37) [in /var/www/vhosts/canarianweekly.com/httpdocs/vendor/cakephp/cakephp/src/Http/ResponseEmitter.php, line 197]
Error: Record not found in table "articles" with primary key [NULL]

Record not found in table "articles" with primary key [NULL] 📋

Cake\Datasource\Exception\InvalidPrimaryKeyException
CORE/src/ORM/Table.php at line 1520 (edit)
     */
    public function get($primaryKey, array $options = []): EntityInterface
    {
        if ($primaryKey === null) {
            throw new InvalidPrimaryKeyException(sprintf(
                'Record not found in table "%s" with primary key [NULL]',
                $this->getTable()
            ));
        }

If you want to customize this error message, create templates/Error/error500.php