JQuery droppable "unspecified error" in IE

I was implementing some Drag'N'Drop algoritms using JQuery .draggable & .droppable plugins, when in IE got "unspecified error". Thanks to Microsoft, they finaly got released so called "Development Tools". Debugging my page using that, gave me exception inside jQuery's code. It was the line saying "d=b.getboundingclientrect()".

It got me a while to understand why that happens, and the answer is:
jQuery's event handles/listerners are not unbinded automatically from the elements you remove from the DOM... they keep firing. So every time you use something like $('...').droppable(...
you should also do $('...').droppable('destroy'), if you remove that $('...') from the DOM. I did.

Conclusion: $('...').droppable('destroy');