diff --git a/lib/upmin/railties/dashboard.rb b/lib/upmin/railties/dashboard.rb
index 3c6391c..8fa1b09 100644
--- a/lib/upmin/railties/dashboard.rb
+++ b/lib/upmin/railties/dashboard.rb
@@ -40,7 +40,7 @@ def last_date
     def group_by_day
       dates = where.not(created_at: nil).group('date(created_at)').order('date(created_at) ASC').count
       # Convert sqlite String date keys to Date keys
-      dates.map { |k, v| [Date.parse(k), v] } if dates.keys.first.is_a? String
+      dates.keys.first.is_a?(String) ? dates.map { |k, v| [Date.parse(k), v] } : []
     end
 
     def group_by_week