Index: src/wp-includes/load.php
===================================================================
--- src/wp-includes/load.php	(revision 38058)
+++ src/wp-includes/load.php	(working copy)
@@ -334,7 +334,7 @@
 		error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );
 	}
 
-	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) ) {
+	if ( defined( 'XMLRPC_REQUEST' ) || defined( 'REST_REQUEST' ) || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) || ( defined( 'WP_INSTALLING' ) && WP_INSTALLING ) ) {
 		@ini_set( 'display_errors', 0 );
 	}
 }