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	diff --git a/includes/Setup.php b/includes/Setup.php
	index 3f30d537dde..c71f54978ac 100644
	--- a/includes/Setup.php
	+++ b/includes/Setup.php
	@@ -133,15 +133,17 @@ require_once MW_INSTALL_PATH . '/includes/Defines.php';
	// Assert that composer dependencies were successfully loaded
	if ( !interface_exists( LoggerInterface::class ) ) {
	$message = (
	- 'MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
	+ '<strong>Error:</strong> MediaWiki requires the <a href="https://github.com/php-fig/log">PSR-3 logging ' .
	"library</a> to be present. This library is not embedded directly in MediaWiki's " .
	"git repository and must be installed separately by the end user.\n\n" .
	'Please see the <a href="https://www.mediawiki.org/wiki/Download_from_Git' .
	'#Fetch_external_libraries">instructions for installing libraries</a> on mediawiki.org ' .
	'for help on installing the required components.'
	);
	+ http_response_code( 500 );
	echo $message;
	- trigger_error( $message, E_USER_ERROR );
	+ error_log( $message );
	+ exit( 1 );
	}

	// Deprecated global variable for backwards-compatibility.