amsynth assert failure: *** buffer overflow detected ***: /usr/bin/amsynth terminated

Binary package hint: amsynth

Expected: normal program start
what happened: crash

$ lsb_release -rd
Description: Ubuntu 9.10
Release: 9.10

$ uname -a
Linux linuxps 2.6.31-15-generic #50-Ubuntu SMP Tue Nov 10 14:53:52 UTC 2009 x86_64 GNU/Linux

$ apt-cache policy amsynth
amsynth:
  Installiert: 1.2.0-4
  Kandidat: 1.2.0-4
  Versions-Tabelle:
 *** 1.2.0-4 0
        500 http://de.archive.ubuntu.com karmic/universe Packages
        100 /var/lib/dpkg/status

ProblemType: Crash
Architecture: amd64
AssertionMessage: *** buffer overflow detected ***: /usr/bin/amsynth terminated
Date: Tue Dec 1 21:08:15 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/amsynth
Package: amsynth 1.2.0-4
ProcCmdline: /usr/bin/amsynth
ProcEnviron:
 LANGUAGE=de_DE:de:en_GB:en
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
Signal: 6
SourcePackage: amsynth
StacktraceTop:
 raise () from /lib/libc.so.6
 abort () from /lib/libc.so.6
 ?? () from /lib/libc.so.6
 __fortify_fail () from /lib/libc.so.6
 __chk_fail () from /lib/libc.so.6
Title: amsynth assert failure: *** buffer overflow detected ***: /usr/bin/amsynth terminated
Uname: Linux 2.6.31-15-generic x86_64
UserGroups: adm admin audio cdrom dialout lpadmin plugdev sambashare uucp vboxusers
XsessionErrors:
 (polkit-gnome-authentication-agent-1:2578): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (acroread:2981): Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/engines/libqtcurve.so: wrong ELF class: ELFCLASS64
 (acroread:2981): Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/engines/libqtcurve.so: wrong ELF class: ELFCLASS64
 (acroread:3220): Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/engines/libqtcurve.so: wrong ELF class: ELFCLASS64
 (acroread:3220): Gtk-WARNING **: /usr/lib/gtk-2.0/2.10.0/engines/libqtcurve.so: wrong ELF class: ELFCLASS64