From 9ecad98b17e2ce7243af3f029e9413178ce566a3 Mon Sep 17 00:00:00 2001
From: Justin DiRose <justin@justindirose.com>
Date: Tue, 10 Sep 2019 10:53:07 -0500
Subject: [PATCH] FIX: Bug with search

---
 plugin.rb | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/plugin.rb b/plugin.rb
index 3b35fc0..a66a505 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -16,10 +16,14 @@ after_initialize do
     if Search.respond_to? :advanced_filter
       Search.advanced_filter(/in:kb/) do |posts|
         selected_categories = SiteSetting.knowledge_explorer_categories.split("|")
-        categories = Category.where('id IN (?)', selected_categories).pluck(:id)
+        if selected_categories
+          categories = Category.where('id IN (?)', selected_categories).pluck(:id)
+        end
 
         selected_tags = SiteSetting.knowledge_explorer_tags.split("|")
-        tags = Tag.where('name IN (?)', selected_tags).pluck(:id)
+        if selected_tags
+          tags = Tag.where('name IN (?)', selected_tags).pluck(:id)
+        end
 
         posts.where('category_id IN (?) OR topics.id IN (SELECT DISTINCT(tt.topic_id) FROM topic_tags tt WHERE tt.tag_id IN (?))', categories, tags)
       end