check-new-release-gtk crashed with TypeError in on_button_ask_me_later_clicked(): integer argument expected, got float

Crashed after clicking on "Ask again".

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.4
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Sat Oct 15 09:58:51 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/lib/update-manager/check-new-release-gtk
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=
 /apps/update-manager/first_run=false
 /apps/update-manager/window_size=(600,600)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release Candidate amd64 (20100928)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python2.7 /usr/lib/update-manager/check-new-release-gtk
ProcEnviron:
 LANGUAGE=de_DE:en
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/lib/update-manager/check-new-release-gtk']
SourcePackage: update-manager
Title: check-new-release-gtk crashed with TypeError in on_button_ask_me_later_clicked(): integer argument expected, got float
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/update-manager/check-new-release-gtk", line 126, in on_button_ask_me_later_clicked
     client.set_int("/apps/update-notifier/release_check_time", int(next_check))
 TypeError: integer argument expected, got float
UpgradeStatus: Upgraded to natty on 2011-03-05 (223 days ago)
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare