diff --git a/app/views/competitions/competitions/charts.json.jbuilder b/app/views/competitions/competitions/charts.json.jbuilder
index 897b674e7..c4a010456 100644
--- a/app/views/competitions/competitions/charts.json.jbuilder
+++ b/app/views/competitions/competitions/charts.json.jbuilder
@@ -4,7 +4,7 @@ json.user_ranks @user_ranks.each do |user_rank|
   json.rank rank == 0 ? "--" : rank
   json.team_name user_rank.name
   json.user_name user_rank.user.real_name
-  json.cost_time rank == 0 && user_rank.cost_time ? "--" : com_spend_time(user_rank.cost_time)
+  json.cost_time rank == 0 || !user_rank.cost_time ? "--" : com_spend_time(user_rank.cost_time)
   json.score rank == 0 ? "--" : user_rank.score.round(2)
   json.competition_prize user_rank.competition_prize
 end