Cannot move melange tips widget/window

[sunweaver]

Whenever I try to move the melange-tips window, this exception gets raised:

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/gi/overrides/GLib.py", line 629, in
return (lambda data: callback(*data), user_data)
File "/usr/lib/python2.7/dist-packages/cream/melange/widget.py", line 299, in move_cb
self.emit('move-request', move_x, move_y)
TypeError: could not convert type int to (null) required for parameter 0