diff --git a/lib/middleman/renderers/sass.rb b/lib/middleman/renderers/sass.rb
index 75e40956..4d183948 100644
--- a/lib/middleman/renderers/sass.rb
+++ b/lib/middleman/renderers/sass.rb
@@ -38,6 +38,8 @@ end
 
 class Tilt::SassPlusCSSFilenameTemplate < Tilt::SassTemplate
   def sass_options
+    return super if basename.nil?
+    
     location_of_sass_file = Middleman::Server.environment == :build ? 
                               File.join(Middleman::Server.root, Middleman::Server.build_dir) : 
                               Middleman::Server.public