instance is undefined

[fiddur]

When using $.addObject I get "instance is undefined" from firebug at line 14.

Changing line 13 (the one above) from:
if (typeof arg == 'string'){
to
if (typeof arg == 'string' && typeof instance !== 'undefined') {

...makes it work well for me.

Actually, I don't see how it could work without that check?!

[fiddur]

This is with jQuery 1.5 and the problem shows itself with a simple test page:

  function test(selection, foo) { $(selection).html(foo); }
  $.addObject('test', test);
  $('body').test('bar');