Weird update error: Use of uninitialized value in join or string at /tmp/config.68351 line 149, <STDIN> line 68904.

[Roman Brodylo <roman.brodylo@mnet-online.de>]

Updating my sarge packages using aptitude, my terminal goes into an
endless loop displaying this line:

Use of uninitialized value in join or string at /tmp/config.68351 line
149, <STDIN> line 68904.
Use of uninitialized value in join or string at /tmp/config.68351 line
149, <STDIN> line 68904.
Use of uninitialized value in join or string at /tmp/config.68351 line
149, <STDIN> line 68904.
Use of uninitialized value in join or string at /tmp/config.68351 line
149, <STDIN> line 68904.

and so on and so on.

Does anyone have an idea what's screwed up?

Thanks,
-- 
Roman Brodylo