gschem crashed with SIGSEGV in show_thumb_cb()

crashed while switching workspaces.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: overlay-scrollbar 0.2.14-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-8.15-generic 3.2.0
Uname: Linux 3.2.0-8-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Mon Jan 23 15:18:28 2012
ExecutablePath: /usr/bin/gschem
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
PackageArchitecture: all
ProcCmdline: /usr/bin/gschem hv_opa.sch
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_US.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7fdd44e0f72b: mov 0xac(%rbx),%ecx
 PC (0x7fdd44e0f72b) ok
 source "0xac(%rbx)" (0xaaaaaaaaaaaaab56) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: overlay-scrollbar
StacktraceTop:
 ?? () from /usr/lib/liboverlay-scrollbar-0.2.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: gschem crashed with SIGSEGV in g_main_context_dispatch()
UpgradeStatus: Upgraded to precise on 2012-01-12 (11 days ago)
UserGroups: adm admin cdrom dialout kvm libvirtd lpadmin plugdev sambashare video