Downloading Attachments in google chrome crashed

When downloading an attached file with google chrome the browser complains about duplicate headers being sent. When looking at the response headers, indeed 2 Content-Disposition headers are being sent:

HTTP/1.1 200 OK

Date: Thu, 09 Feb 2012 17:01:35 GMT

Server: Apache

X-Powered-By: PHP/5.2.16

Pragma: no-cache

Content-Description: File Transfer

Content-Disposition: attachment, filename="code.txt"

Content-Transfer-Encoding: binary

Expires: 0

Cache-Control: must-revalidate, post-check=0, pre-check=0

Content-length: 343

Content-Type: text/plain

Maybe it's because of that .txt file that contains a smarty/html combination. Also pasting the text did not work out for the user - but this is another problem.