diff --git a/lib/proxifier/env.rb b/lib/proxifier/env.rb
index edc0646..4ce92ea 100644
--- a/lib/proxifier/env.rb
+++ b/lib/proxifier/env.rb
@@ -100,6 +100,8 @@ module Proxifier
               return proxy
             end
           end
+
+          nil
         end
     end
   end