From 8bab745586e464f1256f90deb2c635859a5f171d Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov.ru@gmail.com>
Date: Sat, 10 Mar 2018 17:31:32 +0000
Subject: [PATCH] General: In `wp_debug_backtrace_summary()`, check if
 `$call['args']` is defined to avoid a PHP notice.

Props paulschreiber.
Fixes #31215.
Built from https://develop.svn.wordpress.org/trunk@42824


git-svn-id: http://core.svn.wordpress.org/trunk@42654 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/functions.php | 3 ++-
 wp-includes/version.php   | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index 533894bc77..99722d1c7f 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -5410,7 +5410,8 @@ function wp_debug_backtrace_summary( $ignore_class = null, $skip_frames = 0, $pr
 			if ( in_array( $call['function'], array( 'do_action', 'apply_filters', 'do_action_ref_array', 'apply_filters_ref_array' ) ) ) {
 				$caller[] = "{$call['function']}('{$call['args'][0]}')";
 			} elseif ( in_array( $call['function'], array( 'include', 'include_once', 'require', 'require_once' ) ) ) {
-				$caller[] = $call['function'] . "('" . str_replace( $truncate_paths, '', wp_normalize_path( $call['args'][0] ) ) . "')";
+				$filename = isset( $call['args'][0] ) ? $call['args'][0] : '';
+				$caller[] = $call['function'] . "('" . str_replace( $truncate_paths, '', wp_normalize_path( $filename ) ) . "')";
 			} else {
 				$caller[] = $call['function'];
 			}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9bf65c40ea..5bb0f92f6b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42823';
+$wp_version = '5.0-alpha-42824';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.