fontvert pathname contains null byte error

gistfile1.txt

Started POST "/target" for 90.229.215.223 at 2013-05-15 20:27:45 -0600
Processing by CheckInputsController#target as */*
  Parameters: {"file"=>#<ActionDispatch::Http::UploadedFile:0x007f9cab4c37a0 @original_filename="Skia-Regular.woff", @content_type="application/octet-stream", @headers="Content-Disposition: form-data; name=\"file\"; filename=\"Skia-Regular.woff\"\r\nContent-Type: application/octet-stream\r\n", @tempfile=#<File:/var/folders/g0/m3jlqvpd4cbc3khznvn5c_7m0000gn/T/RackMultipart20130515-5063-1k02gby>>, "originalFileName"=>"Skia.ttf"}
WARNING: Can't verify CSRF token authenticity
Completed 500 Internal Server Error in 1ms

ArgumentError (pathname contains null byte):
  app/controllers/check_inputs_controller.rb:18:in `initialize'
  app/controllers/check_inputs_controller.rb:18:in `new'
  app/controllers/check_inputs_controller.rb:18:in `target'


  Rendered /Users/jem/.rvm/gems/ruby-1.9.3-p392/gems/actionpack-3.2.12/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.4ms)
  Rendered /Users/jem/.rvm/gems/ruby-1.9.3-p392/gems/actionpack-3.2.12/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.0ms)
  Rendered /Users/jem/.rvm/gems/ruby-1.9.3-p392/gems/actionpack-3.2.12/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (22.3ms)