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-rw-r--r--config/environments/production.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/config/environments/production.rb b/config/environments/production.rb
index dcb659d6c..0672cd587 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -13,7 +13,7 @@ Rails.application.configure do
   # Full error reports are disabled and caching is turned on.
   config.consider_all_requests_local       = false
   config.action_controller.perform_caching = true
-  config.action_controller.asset_host      = ENV['CDN_HOST']
+  config.action_controller.asset_host      = ENV['CDN_HOST'] if ENV.key?('CDN_HOST')
 
   # Disable serving static files from the `/public` folder by default since
   # Apache or NGINX already handles this.