atril assert failure: atril: ../../src/xcb_io.c:260: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.

[Juozas Pocius]

Crashed while using Xubuntu 20.04 LTS Daily Live image dated 2020-04-16 while in VirtualBox 6.1.6 running on Linux, triggered upon clicking the about menu. After program relaunched about menu box worked ok.
Changed VM settings: Memory: 768 MB, CPU: 2 processors, PAE/NX enabled, Video: 128MB, 3D acceleration enabled, Pointing Device: PS/2 mouse
Host cpu Pentium(R) Dual-Core CPU E6300 @ 2.80GHz

ProblemType: Crash
DistroRelease: Ubuntu 20.04
Package: atril 1.24.0-1
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
Uname: Linux 5.4.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu26
Architecture: amd64
AssertionMessage: atril: ../../src/xcb_io.c:260: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
CasperMD5CheckResult: pass
CasperVersion: 1.445
CurrentDesktop: XFCE
Date: Fri Apr 17 07:23:25 2020
ExecutablePath: /usr/bin/atril
LiveMediaBuild: Xubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200416)
ProcCmdline: atril
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=lt_LT.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: atril
StacktraceTop:
 __assert_fail_base (fmt=0x7f7b97aae588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f7b94180858 "!xcb_xlib_threads_sequence_lost", file=0x7f7b941806c3 "../../src/xcb_io.c", line=260, function=<optimized out>) at assert.c:92
 __GI___assert_fail (assertion=0x7f7b94180858 "!xcb_xlib_threads_sequence_lost", file=0x7f7b941806c3 "../../src/xcb_io.c", line=260, function=0x7f7b94180b10 "poll_for_event") at assert.c:101
 ?? () from /lib/x86_64-linux-gnu/libX11.so.6
 ?? () from /lib/x86_64-linux-gnu/libX11.so.6
 _XEventsQueued () from /lib/x86_64-linux-gnu/libX11.so.6
Title: atril assert failure: atril: ../../src/xcb_io.c:260: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
separator:

[Apport retracing service (apport)]

StacktraceTop:
 __assert_fail_base (fmt=0x7f7b97aae588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=0x7f7b94180858 "!xcb_xlib_threads_sequence_lost", file=0x7f7b941806c3 "../../src/xcb_io.c", line=260, function=<optimized out>) at assert.c:92
 __GI___assert_fail (assertion=assertion@entry=0x7f7b94180858 "!xcb_xlib_threads_sequence_lost", file=file@entry=0x7f7b941806c3 "../../src/xcb_io.c", line=line@entry=260, function=function@entry=0x7f7b94180b10 <__PRETTY_FUNCTION__.14999> "poll_for_event") at assert.c:101
 poll_for_event (dpy=dpy@entry=0x55d814e50a70, queued_only=queued_only@entry=0) at ../../src/xcb_io.c:260
 poll_for_response (dpy=dpy@entry=0x55d814e50a70) at ../../src/xcb_io.c:278
 _XEventsQueued (mode=<optimized out>, dpy=0x55d814e50a70) at ../../src/xcb_io.c:362