diff --git a/config/initializers/docker.rb b/config/initializers/docker.rb
index 809707fb..671eaf2f 100644
--- a/config/initializers/docker.rb
+++ b/config/initializers/docker.rb
@@ -1,6 +1,6 @@
 DockerClient.initialize_environment unless Rails.env.test? && `which docker`.blank?
 
-if ActiveRecord::Base.connection.tables.present? && DockerContainerPool.config[:active]
+if defined?(Rails::Server) && ActiveRecord::Base.connection.tables.present? && DockerContainerPool.config[:active]
   DockerContainerPool.start_refill_task
   at_exit { DockerContainerPool.clean_up }
 end