From 06e509057ee74310c1b033498d9e05169e781bfd Mon Sep 17 00:00:00 2001
From: Arpit Jalan <arpit@techapj.com>
Date: Wed, 3 Jan 2018 17:05:01 +0530
Subject: [PATCH] FIX: handle missing user records

---
 app/serializers/topic_view_serializer.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/app/serializers/topic_view_serializer.rb b/app/serializers/topic_view_serializer.rb
index 9297793726d..1d1577d6d35 100644
--- a/app/serializers/topic_view_serializer.rb
+++ b/app/serializers/topic_view_serializer.rb
@@ -92,9 +92,10 @@ class TopicViewSerializer < ApplicationSerializer
     end
 
     if object.post_counts_by_user.present?
-      result[:participants] = object.post_counts_by_user.map do |pc|
+      participants = object.post_counts_by_user.reject{ |p| object.participants[p].blank? }.map do |pc|
         TopicPostCountSerializer.new({ user: object.participants[pc[0]], post_count: pc[1] }, scope: scope, root: false)
       end
+      result[:participants] = participants if participants.length > 0
     end
 
     if object.links.present?