Draggable: Script error

Draggable: Script error


If I try to drag an element while another element is "on it's way to
it's spot" (after having dragged it), then I get the following error:
this.helper is null
[Break on this error] ui = ui || this._uiHash();\n
I assume it is the same error I get on the live UI website (http://
jqueryui.com/demos/draggable/#sortable), when I try to drag the "drag
me down" box twice, where the second drag is initiated before the box
has stopped after being dropped from the first drag. Does it make any
sense?
I am using UI v1.7.2 and jQuery v1.3.2. The error occurs both in FF3.5
and IE8.