How to Prevent WordPress from stopping rendering without any error mesages, on PHP 7.1+Wordpress (4.7.2)

wp-config-error-handling.php

# Put these on wp-config.php
define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);

function custom_exception_handler($exception)
{
        $logmsg = "Uncaught exception: " . $exception->getMessage() . "\n" . $exception->getTraceAsString() . "\n";
        trigger_error($logmsg, E_ERROR);
        if (WP_DEBUG) {
            echo($logmsg);
        }
}
set_exception_handler('custom_exception_handler');