Error: this.placeholder[0].parentNode is null

[Blackbird]

In function _clear(), there is the following line:

this.placeholder[0].parentNode.removeChild(this.placeholder[0]);

A check is missing IMO. In my code this.placeholder[0].parentNode is null when the above line is executed, therefore displaying an error in the Javascript console.

[Scott González]

Please provide details about the actual bug. What are you doing that causes the error? Please create a reduced test case in jsFiddle or jsbin showing the bug.

[Blackbird]

Hi Scott,

I hadn't seen your answer (can one be notified by email?) I understand sample code would be helpful. I'll try to find the time but cannot guarantee it: the page with the bug is pretty complicated and so it's at least half of day of work to extract the problematic part.

Edit: Posting this reply automatically updated the bug's status back to "new", I didn't do anything for that.

[Scott González]

Replying to Blackbird:

I hadn't seen your answer (can one be notified by email?)

Yes, if you had provided an email address when you created your account, you would have been notified. You should update your account.

I understand sample code would be helpful. I'll try to find the time but cannot guarantee it: the page with the bug is pretty complicated and so it's at least half of day of work to extract the problematic part.

If you have encountered the bug and will have difficulty reproducing it, how long do you think it will take us to try to reproduce it from scratch?

Edit: Posting this reply automatically updated the bug's status back to "new", I didn't do anything for that.

You replied, which is what the pending status is all about.

[Blackbird]

Extracted the bug: ​http://jsfiddle.net/YunGx/7/

How-to: 1) Drag one item from the Unpublish list to the Publish list. Repeat. -> No problem

2) Change the order of the two items in the Publish list -> No problem

3) Drag an item from the Publish list back to the Unpublish list -> Bug!

[Scott González]

Duplicate of #6054.