From 41abef8c30ea91a93b4903485e35f866842e4232 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Joshua=20R=C3=BCsweg?= <josh@bastelstu.be>
Date: Sun, 10 Jun 2018 14:30:21 +0200
Subject: [PATCH] Fix strict type for unserialize See #2508

---
 .../files/lib/system/reaction/ReactionHandler.class.php  | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/wcfsetup/install/files/lib/system/reaction/ReactionHandler.class.php b/wcfsetup/install/files/lib/system/reaction/ReactionHandler.class.php
index c569d7315f..903ce67ec5 100644
--- a/wcfsetup/install/files/lib/system/reaction/ReactionHandler.class.php
+++ b/wcfsetup/install/files/lib/system/reaction/ReactionHandler.class.php
@@ -339,7 +339,14 @@ class ReactionHandler extends SingletonFactory {
 			$likes = $likeObject->likes;
 			$dislikes = $likeObject->dislikes;
 			$cumulativeLikes = $likeObject->cumulativeLikes;
-			$cachedReactions = @unserialize($likeObject->cachedReactions);
+			
+			if ($likeObject->cachedReactions !== null) {
+				$cachedReactions = @unserialize($likeObject->cachedReactions);
+			}
+			else {
+				$cachedReactions = [];
+			}
+			
 			if (!is_array($cachedReactions)) {
 				$cachedReactions = [];
 			}
-- 
2.20.1