Image disappears when dragging mouse out of the window

[treeno]

I have an image, that can be dragged around. But the image disappears, when the mousecursor enteres the icon-menu-bar-thing of Opera while dragging. I think it happens always, when the mouse leaves the area where Opera paints the websites. Leaving just the canvas/paper does not cause the error.
It works fine in Safari, Chrome and Firefox...

JavascriptError:

Event thread: mousemove
Uncaught exception: TypeError: Cannot convert 'parent' to object
Error thrown at line 2316, column 12 in (e) in file://_/raphael.js:
g.win.opera && parent.removeChild(node);
called from line 2241, column 24 in (e) in file://_/raphael.js:
var scrollY = g.doc.documentElement.scrollTop || g.doc.body.scrollTop,

The debugger shows, that parent is null when the error occurs.

Opera Version: 12.13
OS: OS X 10.6.8
Raphael: 2.1.0

I also found this entry on google.groups that describes the same error:
https://groups.google.com/forum/?fromgroups=#!searchin/raphaeljs/opera/raphaeljs/F8Q0gEqO4uM/N5eqNBS1mlYJ

Thanks for creating this great API!
treeno

[treeno]

If you have any questions, don't hesitate to ask me. My bad english might cause some problems reading this.