run crashed with SIGSEGV in pango_glyph_string_extents_range()

[casparvanster]

after about 10 min program crashed

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: lottanzb 0.6-1ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu3
Architecture: amd64
CrashCounter: 1
Date: Sat Apr 14 15:51:14 2012
ExecutablePath: /usr/share/lottanzb/run
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/lottanzb /home/username/Downloads/Transylvania.2006.part01.rar.nzb
ProcEnviron:
 PATH=(custom, no user)
 LANG=nl_NL.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7f489be40ab9 <pango_glyph_string_extents_range+281>: mov (%r14),%esi
 PC (0x7f489be40ab9) ok
 source "(%r14)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%esi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: lottanzb
StacktraceTop:
 pango_glyph_string_extents_range () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
 pango_layout_line_get_extents () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libpango-1.0.so.0
Title: run crashed with SIGSEGV in pango_glyph_string_extents_range()
UpgradeStatus: Upgraded to precise on 2012-03-27 (17 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 pango_glyph_string_extents_range (glyphs=0x1b920e0, start=0, end=14, font=0x1b10460, ink_rect=0x7fff8b59a8d0, logical_rect=0x7fff8b59a8e0) at /build/buildd/pango1.0-1.30.0/./pango/glyphstring.c:209
 pango_layout_run_get_extents (run=0x7f4858026510, run_ink=0x7fff8b59a8d0, run_logical=0x7fff8b59a8e0) at /build/buildd/pango1.0-1.30.0/./pango/pango-layout.c:4497
 pango_layout_line_get_extents (line=0x1cd8590, ink_rect=0x1cd85b8, logical_rect=0x7fff8b59a950) at /build/buildd/pango1.0-1.30.0/./pango/pango-layout.c:4655
 get_line_extents_layout_coords (layout=0x7f4864006c20, line=0x1cd8590, layout_width=-1, y_offset=0, baseline=0x7fff8b59a9fc, line_ink_layout=0x0, line_logical_layout=0x7fff8b59a9e0) at /build/buildd/pango1.0-1.30.0/./pango/pango-layout.c:2436
 pango_layout_get_extents_internal (layout=0x7f4864006c20, ink_rect=0x0, logical_rect=<optimized out>, line_extents=0x0) at /build/buildd/pango1.0-1.30.0/./pango/pango-layout.c:2547