diff --git a/lib/cassy/engine.rb b/lib/cassy/engine.rb
index c49dbb0..1126ad7 100644
--- a/lib/cassy/engine.rb
+++ b/lib/cassy/engine.rb
@@ -1,8 +1,10 @@
 module Cassy
   class Engine < Rails::Engine
     config.config_file = ENV["RUBYCAS_CONFIG_FILE"]
-    config.after_initialize do 
-      config.configuration = HashWithIndifferentAccess.new(YAML.load_file(config.config_file))
+    config.after_initialize do
+      if config.config_file && File.exists?(config.config_file)
+        config.configuration = HashWithIndifferentAccess.new(YAML.load_file(config.config_file))
+      end
     end
   end
 end