diff --git a/server.rb b/server.rb
index dc6ec53..0b8fc73 100644
--- a/server.rb
+++ b/server.rb
@@ -7,6 +7,8 @@
 
   drinkup_name = params['place'] + "-" + params['date']
   summary = []
+  sheets = Github.get_sheets(drinkup_name)
+  return "{}" unless sheets
   Github.get_sheets(drinkup_name).each do |sheet|
     summary << Attendee.collect(drinkup_name, sheet)
   end