Uncaught TypeError: Cannot call method 'toLowerCase' of undefined

Question

I ran into a very vague error while doing some simple jQuery DOM manipulation.

The line that triggered the error is the following:

$(this).closest(\'tr\')

Answer 1

I got exactly the same error on $.get() request.

For me this is the most weird bug in jQuery (my version 1.8.3).

My reason for this error was TD element with ID set to "nodeName".

After change ID value to something else, the error dissapear.

Original:

New: