diff --git a/config/routes.rb b/config/routes.rb
index aec9adf..19d3e92 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,10 +1,12 @@
 Rails.application.routes.draw do
-  Thread.new do
-    c = Cancerpredictfields.last
-    if c
-      sleep(5)
-      c.save
-      c.auto_write_predict_js
+  if ENV['worker_num']=='0' && File.basename($0) != 'rake' && !Rails.const_defined?('Console')
+    Thread.new do
+      c = Cancerpredictfields.last
+      if c
+        sleep(5)
+        c.save
+        c.auto_write_predict_js
+      end
     end
   end
   locales = Site.first.in_use_locales rescue I18n.available_locales