Replying to [ticket:13551 anonymous]:

Hi, Just put in jquery 2.0 b2 in my script and I get an exception.

> $('#SomeElement').data('d');
> 

This line breaks if there's no data set for that element. Can't create a jsfiddle because their library options only support up to beta1, and beta2 was just released a few hours ago. Sylvain Crx.

I'll look at this tomorrow

You can create the jsFiddle, just choose "No-Library (pure JS)" in Frameworks and add an external dependency to jQuery.

Anyway, I can't reproduce the problem, it works fine here:

http://jsfiddle.net/m_gol/tZy7G/

Thanks m_gol!

Sylvain, can you take a look at m_gol's fiddle?

@m_gol: I can see that it works in your jsfiddle but it wasn't working in my code when I made the switch to beta2. I changed my code around to avoid the problem but what I can say is that everything worked fine except that line. My code is about 15,000 lines with a call to jquery every other line long so it's pretty involved.

Ok, I got to repro. The problem was occurring because the element hadn't been generated at the time the code was running when the page was initiating.

Here's your jsfidde with beta2 http://jsfiddle.net/tZy7G/4/

Here's the jsfiddle with beta1 http://jsfiddle.net/2Qbhv/1/

As you can see, in beta1 it doesn't throw the exception but in beta2 it does.

Just a heads up...

$('#some_element).data('d')

That throws in the beta2 example, because it's syntactically invalid—missing the closing quote at the end of "#some_element"

After correcting that, the issue you reported is confirmed. Patch to follow

Fixes #13551. Guard against illegal data access by undefined elem-owner

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Changeset: 692afbcc5f719392c729997eacb234c07d2a6c78

@Rick: indeed, I forgot the closing quote in the jsfiddle but overall, thank you for fixing the underlying issue so quickly. Great job!

Of course and thanks for the report!

#13564 is a duplicate of this ticket.