Ekiga crashes on SIP call end

Ekiga crashes after a SIP call ends with the following output:

*** glibc detected *** ekiga: free(): invalid pointer: 0x08618cf0 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb63a67cd]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb63a9e30]
/usr/lib/libpt.so.1.10.3(_ZN14PAbstractArray15DestroyContentsEv+0x48)[0xb72a9f98]
/usr/lib/libpt.so.1.10.3(_ZN10PContainer8DestructEv+0x57)[0xb72ab0b7]
ekiga(_ZN7PStringD1Ev+0x18)[0x8086278]
/usr/lib/libopal.so.2.2(_ZN7SIP_PDUD0Ev+0x48)[0xb6dbd438]
/usr/lib/libopal.so.2.2(_ZN13SIPConnection20HandlePDUsThreadMainER7PThreadi+0x110)[0xb6da9470]
/usr/lib/libopal.so.2.2(_ZNK13SIPConnection30HandlePDUsThreadMain_PNotifier4CallER7PObjecti+0x25)[0xb6db5235]
/usr/lib/libpt.so.1.10.3(_ZN13PSimpleThread4MainEv+0x2f)[0xb729578f]
/usr/lib/libpt.so.1.10.3(_ZN7PThread14PX_ThreadStartEPv+0x6d)[0xb727e13d]
/lib/tls/i686/cmov/libpthread.so.0[0xb65a231b]
/lib/tls/i686/cmov/libc.so.6(clone+0x5e)[0xb640e57e]
======= Memory map: ========
08048000-0810a000 r-xp 00000000 08:03 2714677 /usr/bin/ekiga
0810a000-08111000 rw-p 000c2000 08:03 2714677 /usr/bin/ekiga
08111000-086dc000 rw-p 08111000 00:00 0 [heap]
b0a21000-b0a22000 ---p b0a21000 00:00 0
b0a22000-b0a62000 rw-p b0a22000 00:00 0
b0a62000-b0a63000 ---p b0a62000 00:00 0
b0a63000-b0aa3000 rw-p b0a63000 00:00 0
b0aa3000-b0aa4000 ---p b0aa3000 00:00 0
b0aa4000-b0ae4000 rw-p b0aa4000 00:00 0
b0ae4000-b0ae6000 r-xp 00000000 08:03 2485592 /lib/libnss_mdns4.so.2
b0ae6000-b0ae7000 rw-p 00001000 08:03 2485592 /lib/libnss_mdns4.so.2
b0afd000-b0b0d000 r--s 00000000 08:03 3471877 /usr/share/mime/mime.cache
b0b0d000-b0b0e000 r--s 00000000 08:04 3588459 /home/marian/.local/share/mime/mime.cache
b0b0e000-b0b0f000 ---p b0b0e000 00:00 0
b0b0f000-b0b4f000 rw-p b0b0f000 00:00 0
b0b4f000-b0bbd000 r--p 00000000 08:03 2912684 /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Oblique.ttf
b0bbd000-b0bbe000 ---p b0bbd000 00:00 0
b0bbe000-b0bfe000 rw-p b0bbe000 00:00 0
b0bfe000-b0bff000 ---p b0bfe000 00:00 0
b0bff000-b13ff000 rw-p b0bff000 00:00 0
b13ff000-b1400000 ---p b13ff000 00:00 0
b1400000-b1c37000 rw-p b1400000 00:00 0
b1c37000-b1d00000 ---p b1c37000 00:00 0
b1d3b000-b1d3c000 ---p b1d3b000 00:00 0
b1d3c000-b1d7c000 rw-p b1d3c000 00:00 0
b1d7c000-b1d7d000 ---p b1d7c000 00:00 0
b1d7d000-b1dbd000 rw-p b1d7d000 00:00 0
b1dbd000-b1dbe000 ---p b1dbd000 00:00 0
b1dbe000-b1dfe000 rw-p b1dbe000 00:00 0
b1dfe000-b1dff000 ---p b1dfe000 00:00 0
b1dff000-b25ff000 rw-p b1dff000 00:00 0
b25ff000-b2600000 ---p b25ff000 00:00 0
b2600000-b2e00000 rw-p b2600000 00:00 0
b2e00000-b2e07000 r-xp 00000000 08:03 2715906 /usr/lib/libfam.so.0.0.0
b2e07000-b2e08000 rw-p 00006000 08:03 2715906 /usr/lib/libfam.so.0.0.0
b2e08000-b2e0e000 r-xp 00000000 08:03 2485531 /lib/libacl.so.1.1.0
b2e0e000-b2e0f000 rw-p 00005000 08:03 2485531 /lib/libacl.so.1.1.0
b2e0f000-b2e12000 r-xp 00000000 08:03 2485535 /lib/libattr.so.1.1.0
b2e12000-b2e13000 rw-p 00002000 08:03 2485535 /lib/libattr.so.1.1.0
b2e1c000-b2e20000 r-xp 00000000 08:03 2519505 /lib/tls/i686/cmov/libnss_dns-2.5.so
b2e20000-b2e22000 rw-p 00003000 08:03 2519505 /lib/tls/i686/cmov/libnss_dns-2.5.so
b2e22000-b2e28000 r-xp 00000000 08:03 2763885 /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so
b2e28000-b2e29000 rw-p 00005000 08:03 2763885 /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so
b2e29000-b2e35000 r-xp 00000000 08:03 2763801 /usr/lib/gnome-vfs-2.0/modules/libfile.so
b2e35000-b2e36000 rw-p 0000b000 08:03 2763801 /usr/lib/gnome-vfs-2.0/modules/libfile.so
b2e36000-b2e40000 r-xp 00000000 08:03 2763859 /usr/lib/gtk-2.0/2.10.0/filesystems/libgnome-vfs.so
b2e40000-b2e41000 rw-p 00009000 08:03 2763859 /usr/lib/gtk-2.0/2.10.0/filesystems/libgnome-vfs.so
b2e41000-b2ea1000 rw-s 00000000 00:08 6062118 /SYSV00000000 (deleted)
b2ea1000-b2f17000 r--p 00000000 08:03 2912681 /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans-Bold.ttf
b2f17000-b2f94000 r--p 00000000 08:03 2912685 /usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf
b2f94000Aborted (core dumped)
marian@coredump:~$