gnome-shell crashed with SIGSEGV in gjs_value_from_g_argument()

[Forage]

A maximized terminal window lost his header bar all of a sudden. After closing this one, Shell crashed and restarted.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: gnome-shell 3.20.1-0ubuntu1~xenial3 [origin: LP-PPA-gnome3-team-gnome3-staging]
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Apr 27 13:30:42 2016
DisplayManager:

EcryptfsInUse: Yes
ExecutablePath: /usr/bin/gnome-shell
InstallationDate: Installed on 2015-11-26 (152 days ago)
InstallationMedia: It
ProcCmdline: /usr/bin/gnome-shell
SegvAnalysis:
 Segfault happened at: 0x7f1e7fb1a6e0 <gjs_value_from_g_argument+976>: mov (%rax),%rax
 PC (0x7f1e7fb1a6e0) ok
 source "(%rax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 gjs_value_from_g_argument () from /usr/lib/libgjs.so.0
 ?? () from /usr/lib/libgjs.so.0
 ?? () from /usr/lib/libgjs.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libmozjs-24.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libmozjs-24.so.0
Title: gnome-shell crashed with SIGSEGV in gjs_value_from_g_argument()
UpgradeStatus: Upgraded to xenial on 2016-04-22 (4 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers

[Ubuntu GNOME (ug-bot)]

StacktraceTop:
 gjs_value_from_g_argument(JSContext*, jsval*, GITypeInfo*, GArgument*, gboolean) (context=context@entry=0x1f86e10, value_p=value_p@entry=0x7ffc9455e670, type_info=type_info@entry=0x7ffc9455e820, arg=arg@entry=0x7ffc9455e800, copy_structs=copy_structs@entry=1) at gi/arg.cpp:2684
 gjs_invoke_c_function(JSContext*, Function*, JSObject*, unsigned int, jsval*, jsval*, GArgument*) (context=context@entry=0x1f86e10, function=function@entry=0x3781860, obj=obj@entry=0x7f1e2b465070, js_argc=js_argc@entry=0, js_argv=js_argv@entry=0x21999d0, js_rval=js_rval@entry=0x7ffc9455ea00, r_value=0x0) at gi/function.cpp:1058
 function_call(JSContext*, unsigned int, jsval*) (context=0x1f86e10, js_argc=0, vp=0x21999c0) at gi/function.cpp:1322
 js::Invoke(JSContext*, JS::CallArgs, js::MaybeConstruct) () at /tmp/apport_sandbox_ZxzU0t/usr/lib/x86_64-linux-gnu/libmozjs-24.so.0
 Interpret(JSContext*, js::RunState&) () at /tmp/apport_sandbox_ZxzU0t/usr/lib/x86_64-linux-gnu/libmozjs-24.so.0