aptitude GUI shows strange messages

["Hans-J. Ullrich" <hans.ullrich@loop.de>]

Hi folks, 
since some weeks I randomly get some strange messages in aptitude ncurses 
interface, mainly when dependencies are collected. The message is telling:

Internal error: found 2 (choice -> promotion) mappings for a single choice.

These lines appear a dozen times.

When I am using aptitude in the commandline mode, this message does not 
appear. Does someone see the same as me?

Everything else is working perfectly, no other misbehaviour is found.

Is this a bug???

Best regards

Hans