The "drakrpm-update" program crashed. Drakbug-16.26.8 caught it.

In a VirtualBox, from Mageia4, remove medias and add Cauldron medias. urpmi --auto-update fails. This bug arises when i try the update from the MCC.
[root@localhost ~]# lspcidrake -v
unknown         : Intel Corporation|82801HM/HEM (ICH8M/ICH8M-E) SATA Controller [AHCI mode] [STORAGE_SATA] (vendor:8086 device:2829) (rev: 02)
i2c_piix4       : Intel Corporation|82371AB/EB/MB PIIX4 ACPI [BRIDGE_OTHER] (vendor:8086 device:7113) (rev: 08)
ohci_pci        : Apple Inc.|KeyLargo/Intrepid USB [SERIAL_USB] (vendor:106b device:003f)
snd_intel8x0    : Intel Corporation|82801AA AC'97 Audio Controller [MULTIMEDIA_AUDIO] (vendor:8086 device:2415 subv:8086 subd:0000) (rev: 01)
unknown         : InnoTek Systemberatung GmbH|VirtualBox Guest Service [SYSTEM_OTHER] (vendor:80ee device:cafe)
e1000           : Intel Corporation|82540EM Gigabit Ethernet Controller [NETWORK_ETHERNET] (vendor:8086 device:100e subv:8086 subd:001e) (rev: 02)
Card:VirtualBox virtual video card: InnoTek Systemberatung GmbH|VirtualBox Graphics Adapter [DISPLAY_VGA] (vendor:80ee device:beef)
ata_piix        : Intel Corporation|82371AB/EB/MB PIIX4 IDE [STORAGE_IDE] (vendor:8086 device:7111) (rev: 01)
unknown         : Intel Corporation|82371SB PIIX3 ISA [Natoma/Triton II] [BRIDGE_ISA] (vendor:8086 device:7000)
unknown         : Intel Corporation|440FX - 82441FX PMC [Natoma] [BRIDGE_HOST] (vendor:8086 device:1237) (rev: 02)
hub             : Linux 3.12.18-desktop-1.mga4 ohci_hcd|OHCI PCI host controller [Hub|Unused|Full speed (or root) hub] (vendor:1d6b device:0001)
usbhid          : VirtualBox|USB Tablet [Human Interface Device|No Subclass|None] (vendor:80ee device:0021)
hid_generic     : VirtualBox USB Tablet
[root@localhost ~]# 


Can't call method "flag_skip" on an undefined value at /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm line 582.
Perl's trace:
standalone::bug_handler() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:582
URPM::find_candidate_packages() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:1503
URPM::__ANON__() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:737
URPM::__ANON__() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:701
URPM::__ANON__() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:703
URPM::with_db_unsatisfied_requires() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:737
URPM::with_any_unsatisfied_requires() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:1549
URPM::_handle_diff_provides() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:1283
URPM::resolve_requested__no_suggests_() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:1174
URPM::resolve_requested__no_suggests() called from /usr/lib/perl5/vendor_perl/5.18.1/x86_64-linux-thread-multi/URPM/Resolve.pm:1106
URPM::resolve_requested() called from /usr/lib/perl5/vendor_perl/5.18.1/urpm/select.pm:404
urpm::select::_resolve_priority_upgrades() called from /usr/lib/perl5/vendor_perl/5.18.1/urpm/select.pm:391
urpm::select::resolve_priority_upgrades_after_auto_select() called from /usr/lib/perl5/vendor_perl/5.18.1/Rpmdrake/pkg.pm:393
Rpmdrake::pkg::get_updates_list() called from /usr/lib/perl5/vendor_perl/5.18.1/Rpmdrake/pkg.pm:509
Rpmdrake::pkg::get_pkgs() called from /usr/lib/perl5/vendor_perl/5.18.1/Rpmdrake/gui.pm:642
Rpmdrake::gui::pkgs_provider() called from /usr/libexec/drakrpm-update:266
main::run_treeview_dialog() called from /usr/libexec/drakrpm-update:293

Theme name: xl_monochrome
Kernel version = 3.12.18-desktop-1.mga4
Distribution=Mageia release 4 (Official) for x86_64
CPU=AMD FX(tm)-6200 Six-Core Processor