From d9f7a5a348e7776c6f659cb2f2c67caa2aa3cb96 Mon Sep 17 00:00:00 2001
From: Matthias Schmidt <gravatronics@live.com>
Date: Sun, 27 Nov 2016 14:22:13 +0100
Subject: [PATCH] Fix category validation in
 AbstractCategorizedACPSearchResultProvider

---
 ...ractCategorizedACPSearchResultProvider.class.php | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php b/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php
index b906b13d85..b47c258e62 100644
--- a/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php
+++ b/wcfsetup/install/files/lib/system/search/acp/AbstractCategorizedACPSearchResultProvider.class.php
@@ -109,9 +109,16 @@ abstract class AbstractCategorizedACPSearchResultProvider extends AbstractACPSea
 		
 		// create level 2 categories
 		$topCategories = [];
-		foreach ($this->categories as $category) {
-			if ($category->parentCategoryName && in_array($category->parentCategoryName, $this->topCategories)) {
-				$topCategories[] = $category->categoryName;
+		foreach ($this->categories as $key => $category) {
+			if ($category->parentCategoryName) {
+				// check if parent category exists, thus if it is valid; if is does not exist, then all
+				// child categories are also invalid
+				if (!isset($this->categories[$category->parentCategoryName])) {
+					unset($this->categories[$key]);
+				}
+				else if (in_array($category->parentCategoryName, $this->topCategories)) {
+					$topCategories[] = $category->categoryName;
+				}
 			}
 		}
 		
-- 
2.20.1