You can temporarily turn on error display.
In the web root directory, open the index.php file in an editor and add the following lines
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
Your file should look like this
<?php
error_reporting(E_ALL);
ini_set('display_errors', TRUE);
/**
* DO NOT EDIT THIS FILE!
* Make a copy of the ipconfig.php.example file, rename the copy to 'ipconfig.php' and set your settings in this file
*/
/*
*---------------------------------------------------------------
* LOAD DOTENV
*---------------------------------------------------------------
*/
// .......
// ..........