bootstrap.min.css.map missing

[peternewman]

In Chrome:

Uncaught TypeError: Cannot read property 'opener' of null jquery.min.js:3Ca jquery.min.js:3n.cssHooks.(anonymous function).set jquery.min.js:3n.extend.style jquery.min.js:3(anonymous function) jquery.min.js:4K jquery.min.js:2n.fn.(anonymous function) jquery.min.js:4(anonymous function) jquery-ui.min.js:5(anonymous function) jquery-ui.min.js:5
GET http://rdm.openlighting.org/libs/bootstrap/css/bootstrap.min.css.map 404 (Not Found) 

And indeed it's missing: http://rdm.openlighting.org/libs/bootstrap/css/bootstrap.min.css.map

The minified version is there fine though: http://rdm.openlighting.org/libs/bootstrap/css/bootstrap.min.css