SQL Syntax error when subscribing to empty Meeting

Started POST "/meetings/10/subscribe" for ::1 at 2016-04-03 10:05:11 +0200
Processing by SubscriptionMakerController#create as HTML
  Parameters: {"authenticity_token"=>"sVBy0prVaHUxQV+znhDrJe9afJWGv2SgktXBIdE6iqu/b4sj8IO3qJ8GiZtl4xUe0fvPrN8rgi06zuKn6VTLeA==", "meeting_id"=>"10"}
  User Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1  [["id", 1]]
  Meeting Load (0.3ms)  SELECT  "meetings".* FROM "meetings" WHERE "meetings"."id" = $1 LIMIT 1  [["id", 10]]
   (0.2ms)  SELECT "meeting_dates"."id" FROM "meeting_dates" WHERE "meeting_dates"."meeting_id" = $1  [["meeting_id", 10]]
   (0.1ms)  BEGIN
   (0.8ms)  INSERT INTO user_dates ("user_id", "meeting_date_id", "updated_at", "created_at") VALUES 
   (0.2ms)  ROLLBACK
Completed 500 Internal Server Error in 7ms (ActiveRecord: 1.8ms)

ActiveRecord::StatementInvalid (PG::SyntaxError: ERROR:  syntax error at end of input
LINE 1: ..._id", "meeting_date_id", "updated_at", "created_at") VALUES 
                                                                       ^
: INSERT INTO user_dates ("user_id", "meeting_date_id", "updated_at", "created_at") VALUES ):
  app/controllers/subscription_maker_controller.rb:14:in `block in create'
  app/controllers/subscription_maker_controller.rb:9:in `create'

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  Rendered /home/poulet_a/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb within layouts/javascript (0.4ms)
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Nephos / MeetUs

SQL Syntax error when subscribing to empty Meeting #11
