diff --git a/app/models/wiki_page.rb b/app/models/wiki_page.rb
index 74a7a9095..752ea2713 100644
--- a/app/models/wiki_page.rb
+++ b/app/models/wiki_page.rb
@@ -50,7 +50,7 @@ class WikiPage < ApplicationRecord
 
   module SearchMethods
     def titled(title)
-      find_by(title: title.downcase.tr(" ", "_"))
+      find_by(title: title&.downcase&.tr(" ", "_"))
     end
 
     def active
diff --git a/test/unit/wiki_page_test.rb b/test/unit/wiki_page_test.rb
index c5278c148..c7d5f229e 100644
--- a/test/unit/wiki_page_test.rb
+++ b/test/unit/wiki_page_test.rb
@@ -61,6 +61,7 @@ class WikiPageTest < ActiveSupport::TestCase
 
       should "search by title" do
         assert_equal("hot_potato", WikiPage.titled("hot potato").title)
+        assert_nil(WikiPage.titled(nil))
       end
 
       should "search other names with wildcards" do