Can't upgrade python24

[Vincent Lefevre]

I want to upgrade to python24 @2.4.4_1, but I get the following error:

prunille:~> sudo port -v -d upgrade python24
DEBUG: Found port in file:///Users/vinc17/software/dports/lang/python24
DEBUG: Found port in file:///opt/local/var/db/dports/sources/rsync.rsync.macports.org_dpupdate_dports/lang/python24
--->  Activating python24 2.4.4_0+darwin_8
DEBUG: Image error: Another version of this port (python24 @2.4.3_1+darwin_8) is already active.
    while executing
"portimage::activate $portname $version_installed$variant $optionslist"
Error: Activating python24 2.4.4_0 failed: Image error: Another version of this port (python24 @2.4.3_1+darwin_8) is already active.

Adding @2.4.4_1 doesn't change anything. Anyone knows what's wrong?
A bug in "port upgrade"?

FYI:

prunille:~> port installed python24
The following ports are currently installed:
  python24 @2.4.3_1+darwin_8 (active)
  python24 @2.4.4_0+darwin_8
prunille:~> port info python24
Warning: Found 2 port python24 definitions, displaying first one.
python24 2.4.4, Revision 1, lang/python24 (Variants: universal, puredarwin, darwin_8)
http://www.python.org/

Python is an interpreted, interactive, object-oriented programming language.

Library Dependencies: gettext
Platforms: darwin
Maintainers: mww at macports.org
prunille:~> port version
Version: 1.442

The PortIndex file is up-to-date.

-- 
Vincent Lefèvre <vincent at vinc17.org> - Web: <http://www.vinc17.org/>
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Work: CR INRIA - computer arithmetic / Arenaire project (LIP, ENS-Lyon)