diff --git a/app/serializers/post_revision_serializer.rb b/app/serializers/post_revision_serializer.rb
index 0565a1a0032..1f8c07adf58 100644
--- a/app/serializers/post_revision_serializer.rb
+++ b/app/serializers/post_revision_serializer.rb
@@ -112,8 +112,10 @@ class PostRevisionSerializer < ApplicationSerializer
   end
 
   def title_changes
-    prev = "<div>#{CGI::escapeHTML(previous["title"])}</div>"
-    cur = "<div>#{CGI::escapeHTML(current["title"])}</div>"
+
+    prev = "<div>#{previous["title"] && CGI::escapeHTML(previous["title"])}</div>"
+    cur = "<div>#{current["title"] && CGI::escapeHTML(current["title"])}</div>"
+
     return if prev == cur
 
     diff = DiscourseDiff.new(prev, cur)