dbus crashed with SIGABRT in _dbus_abort()

[Jane Doe]

bionic beaver @ dell xps12

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: cups-daemon 2.2.7-1ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu5
Architecture: amd64
Date: Mon Apr 16 20:42:40 2018
ExecutablePath: /usr/lib/cups/notifier/dbus
InstallationDate: Installed on 2018-03-11 (37 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
Lpstat:
 device for HP_LaserJet_500_color_M551_2F183C_: ipp://BKPRT777.local:631/ipp/print
 device for <email address hidden>: ipps://BKPRT777.local:443/ipp/print
 device for Lexmark-W820-Bravo: socket://10.42.9.152:9100
MachineType: Dell Inc. XPS 12 9Q23
Papersize: letter
PpdFiles:
 Lexmark-W820-Bravo: Lexmark W820 PS
 <email address hidden>: HP LaserJet 500 color M551, driverless, cups-filters 1.20.2
ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=UUID=e8186b16-2ca7-47a4-a261-792524adbc6b ro quiet splash i8042.direct i8042.dumbkbd vt.handoff=1
ProcEnviron: PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic root=UUID=e8186b16-2ca7-47a4-a261-792524adbc6b ro quiet splash i8042.direct i8042.dumbkbd vt.handoff=1
Signal: 6
SourcePackage: cups
StacktraceTop:
 _dbus_abort () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 _dbus_warn_check_failed () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 dbus_message_iter_append_basic () from /lib/x86_64-linux-gnu/libdbus-1.so.3
 ?? ()
 __libc_start_main (main=0x55f0c84c81b0, argc=3, argv=0x7ffcaf592438, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffcaf592428) at ../csu/libc-start.c:310
Title: dbus crashed with SIGABRT in _dbus_abort()
UpgradeStatus: Upgraded to bionic on 2018-03-11 (37 days ago)
UserGroups:

dmi.bios.date: 12/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.asset.tag: 0004061282
dmi.board.name: 0520M8
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.asset.tag: 0004061282
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A05
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd12/07/2012:svnDellInc.:pnXPS129Q23:pvrA05:rvnDellInc.:rn0520M8:rvrA00:cvnDellInc.:ct8:cvrA05:
dmi.product.family: 103C_5335KV
dmi.product.name: XPS 12 9Q23
dmi.product.version: A05
dmi.sys.vendor: Dell Inc.

[Apport retracing service (apport)]

StacktraceTop:
 _dbus_abort () at ../../../dbus/dbus-sysdeps.c:93
 _dbus_warn_check_failed (format=format@entry=0x7f1875ac87c8 "arguments to %s() were incorrect, assertion \"%s\" failed in file %s line %d.\nThis is normally a bug in some application using the D-Bus library.\n") at ../../../dbus/dbus-internals.c:281
 _dbus_warn_return_if_fail (function=function@entry=0x7f1875ac71b0 <__func__.5319> "dbus_message_iter_append_basic", assertion=assertion@entry=0x7f1875ac64b8 "_dbus_check_is_valid_utf8 (*string_p)", file=file@entry=0x7f1875ac6a1d "../../../dbus/dbus-message.c", line=line@entry=2754) at ../../../dbus/dbus-internals.c:936
 dbus_message_iter_append_basic (iter=0x7ffcaf592190, type=115, value=0x7ffcaf592168) at ../../../dbus/dbus-message.c:2754
 main (argc=<optimized out>, argv=<optimized out>) at dbus.c:369

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[oldfred (oldfred)]

Just had this error in 20.04.
But may be related to this already reported:
[Bug 1866838] [NEW] ippusbxd crashed with SIGSEGV in usb_conn_acquire()