From 2ce76e4c0cd3f73483213854a641c12b2059d18a Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Wed, 11 Oct 2017 16:25:47 +0200
Subject: [PATCH] Fixed element parent block detection

---
 .../input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php
index 7162f5140a..bdf37f6d77 100644
--- a/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php
+++ b/wcfsetup/install/files/lib/system/html/input/node/HtmlInputNodeWoltlabMetacodeMarker.class.php
@@ -344,6 +344,10 @@ class HtmlInputNodeWoltlabMetacodeMarker extends AbstractHtmlInputNode {
 				$parentEnd = $end;
 				do {
 					$parentEnd = $parentEnd->parentNode;
+					if ($parentEnd === null) {
+						break;
+					}
+					
 					if ($parentEnd->nodeName === 'li') {
 						if ($parent === $parentEnd) {
 							// same ancestor, exit both loops
@@ -354,7 +358,7 @@ class HtmlInputNodeWoltlabMetacodeMarker extends AbstractHtmlInputNode {
 						break;
 					}
 				}
-				while ($parent);
+				while ($parentEnd);
 				
 				$foundLi = true;
 			}
-- 
2.20.1