jQuery Forum

You are requesting a jQuery selector (':') whereas you should be using a class selector ('.'):

1. $('#dialog-add.ui-dialog').dialog('destroy');

BTW, you probably don't need either as the ID uniquely identifies the element.

Thanks but...

Change the colon (:) for a (.) and still receive the same error.
The strangest part is that it always happens when trying to open the dialog a second time. The first time it works without problems.

What could be the solution?