software-properties-gtk crashed with SIGSEGV in g_callable_info_free_closure()

Errors bucket:
https://errors.ubuntu.com/bucket/?id=/usr/bin/software-properties-gtk%3A11%3Ag_callable_info_free_closure%3A_pygi_invoke_closure_free%3A_pygi_marshal_cleanup_from_py_interface_callback%3Apygi_marshal_cleanup_args_from_py_marshal_success%3Apygi_callable_info_invoke

Multiple crashes with package-related apps when starting Ubuntu (14.04, after update from 13.10)

ProblemType: CrashDistroRelease: Ubuntu 14.04
Package: software-properties-gtk 0.92.34
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic i686
NonfreeKernelModules: fglrx
ApportVersion: 2.13.3-0ubuntu1
Architecture: i386
CurrentDesktop: Unity
Date: Fri Mar 28 08:05:57 2014
ExecutablePath: /usr/bin/software-properties-gtk
ExecutableTimestamp: 1393623543
InstallationDate: Installed on 2012-08-11 (594 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/software-properties-gtk
ProcCwd: /tmp/guest-Wd0zD7
SegvAnalysis:
 Segfault happened at: 0xb6405c97 <g_callable_info_free_closure+23>: mov 0x8(%eax),%eax
 PC (0xb6405c97) ok
 source "0x8(%eax)" (0x00000008) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11SourcePackage: software-properties
StacktraceTop:
 g_callable_info_free_closure () from /usr/lib/libgirepository-1.0.so.1
 ?? () from /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-i386-linux-gnu.so
 ?? () from /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-i386-linux-gnu.so
 ?? () from /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-i386-linux-gnu.so
 ?? () from /usr/lib/python3/dist-packages/gi/_gi.cpython-34m-i386-linux-gnu.so
Title: software-properties-gtk crashed with SIGSEGV in g_callable_info_free_closure()
UpgradeStatus: Upgraded to trusty on 2014-03-26 (2 days ago)
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