From fe68b6cc889fe997909748b9662672d3c346a4bd Mon Sep 17 00:00:00 2001
From: Guo Xiang Tan <tgx_world@hotmail.com>
Date: Fri, 25 May 2018 16:40:00 +0800
Subject: [PATCH] FIX: Don't unassign topic on flag reviewed if topic has been
 deleted.

* Should have a test for this.
---
 plugin.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/plugin.rb b/plugin.rb
index c259380..954ad10 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -215,7 +215,8 @@ after_initialize do
   # Unassign if there are no more flags in the topic
   on(:flag_reviewed) do |post|
     if SiteSetting.assign_locks_flags? &&
-      FlagQuery.flagged_post_actions(topic_id: post.topic_id).count == 0
+      post.topic &&
+      FlagQuery.flagged_post_actions(topic_id: post.topic.id).count == 0
 
       assigner = ::TopicAssigner.new(post.topic, Discourse.system_user)
       assigner.unassign