UI 1.5b Slider slider('destroy') throws excetion

The following line throws an exception:

this.handles.removeMouseInteraction(); ( line 141 )

when I call the destroy method, stating thet this.handle has no properties.

I checked the object is null.

I tried the following ( removing the s at the end, as I can see there is a handle property not a handles one) .

although I do this, and then I re-create the slider, it just does not work, the min, max uses the old slider values, also the drag does not get initialized properly.

this.handle.removeMouseInteraction();