Compiz crashes when input language is changed in lock screen

When I change the language on lock screen with keyboard shortcut, the system freezes for a few seconds, the lock screen disappears (I haven't typed a password), for fraction of a second I see all my windows and then the lock screen appears again.

I can recreate this every time (on two clean Ubuntu installations with the latest updates), but it happens only if I change the language with a keyboard shortcut. Everything is fine if I change the language from the top menu.

After I login ubuntu-bug utility reports an issue with /usr/bin/compiz.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: compiz-core 1:0.9.12.2+16.04.20160714-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
BootLog: /dev/sda1: clean, 399823/1038352 files, 2561105/4150016 blocks
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CrashCounter: 1
CurrentDesktop: Unity
Date: Sun Jul 24 11:20:06 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus: vboxhost, 5.0.26, 4.4.0-31-generic, x86_64: installed
ExecutablePath: /usr/bin/compiz
ExecutableTimestamp: 1468512841
GraphicsCard:
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Lenovo 4th Gen Core Processor Integrated Graphics Controller [17aa:5028]
MachineType: LENOVO 20C500F8BM
ProcCmdline: compiz
ProcCwd: /home/ceco
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic root=UUID=b1e2cf33-5f74-4681-ba6d-917bc0337555 ro quiet splash vt.handoff=7
Signal: 6
SourcePackage: compiz
StacktraceTop:
 __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
 void boost::throw_exception<boost::bad_function_call>(boost::bad_function_call const&) () from /usr/lib/x86_64-linux-gnu/compiz/libunityshell.so
Title: compiz crashed with SIGABRT in __gnu_cxx::__verbose_terminate_handler()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dialout dip lpadmin plugdev sambashare sudo vboxusers wireshark
dmi.bios.date: 02/04/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: J9ET9DWW (2.23 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20C500F8BM
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 PRO
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvrJ9ET9DWW(2.23):bd02/04/2016:svnLENOVO:pn20C500F8BM:pvrThinkPadEdgeE440:rvnLENOVO:rn20C500F8BM:rvrSDK0E50510PRO:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20C500F8BM
dmi.product.version: ThinkPad Edge E440
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Sun Jul 24 10:28:08 2016
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 1020
 vendor LGD
xserver.version: 2:1.18.3-1ubuntu2.2