diff --git a/app/models/message.rb b/app/models/message.rb
index e00b68ca..de7fd5d1 100644
--- a/app/models/message.rb
+++ b/app/models/message.rb
@@ -17,6 +17,6 @@ class Message < ApplicationRecord
   end
   
   def after_created
-    ActionCable.server.broadcast 'map_' + map.id.to_s, type: 'messageCreated', message: self.as_json
+    ActionCable.server.broadcast 'map_' + resource.id.to_s, type: 'messageCreated', message: self.as_json
   end
 end