From 427d72c8a1892b9db0377d62cbd7abc45b20cbdf Mon Sep 17 00:00:00 2001
From: Sergey Biryukov <sergeybiryukov@git.wordpress.org>
Date: Tue, 8 Sep 2020 13:39:41 +0000
Subject: [PATCH] Comments: Check if a valid comment ID was passed when editing
 a comment.

This avoids a PHP notice after submitting the Edit Comment form.

Props regan.khadgi.
Fixes #51263.

git-svn-id: https://develop.svn.wordpress.org/trunk@48958 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-admin/comment.php | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/wp-admin/comment.php b/src/wp-admin/comment.php
index bdba4604a8..550045f9ec 100644
--- a/src/wp-admin/comment.php
+++ b/src/wp-admin/comment.php
@@ -36,14 +36,18 @@ if ( isset( $_GET['dt'] ) ) {
 	}
 }
 
-$comment_id = absint( $_GET['c'] );
-$comment    = get_comment( $comment_id );
+if ( isset( $_REQUEST['c'] ) ) {
+	$comment_id = absint( $_REQUEST['c'] );
+	$comment    = get_comment( $comment_id );
 
-// Prevent actions on a comment associated with a trashed post.
-if ( 'trash' === get_post_status( $comment->comment_post_ID ) ) {
-	wp_die(
-		__( 'You can&#8217;t edit this comment because the associated post is in the Trash. Please restore the post first, then try again.' )
-	);
+	// Prevent actions on a comment associated with a trashed post.
+	if ( $comment && 'trash' === get_post_status( $comment->comment_post_ID ) ) {
+		wp_die(
+			__( 'You can&#8217;t edit this comment because the associated post is in the Trash. Please restore the post first, then try again.' )
+		);
+	}
+} else {
+	$comment = null;
 }
 
 switch ( $action ) {