Public bug reported:

After aptitude started reporting errors during a run of appstreamcli, I
checked the mentioned command manually, and indeed it fails with a glib
error:

marc@ellen:~$ sudo appstreamcli refresh-cache

(appstreamcli:16742): GLib-CRITICAL **: 18:30:00.982:
g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types ||
GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite
(GVSB(builder)->type)' failed

(appstreamcli:16742): GLib-CRITICAL **: 18:30:00.982:
g_variant_new_variant: assertion 'value != NULL' failed

(appstreamcli:16742): GLib-ERROR **: 18:30:00.982: g_variant_new_parsed: 
11-13:invalid GVariant format string
Trace/breakpoint trap

I also tried:

marc@ellen:~$ sudo appstreamcli refresh

(appstreamcli:16676): GLib-CRITICAL **: 18:29:54.246:
g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types ||
GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite
(GVSB(builder)->type)' failed

(appstreamcli:16676): GLib-CRITICAL **: 18:29:54.246:
g_variant_new_variant: assertion 'value != NULL' failed

(appstreamcli:16676): GLib-ERROR **: 18:29:54.246: g_variant_new_parsed: 
11-13:invalid GVariant format string
Trace/breakpoint trap

marc@ellen:~$ sudo appstreamcli refresh --force

(appstreamcli:17374): GLib-CRITICAL **: 18:30:36.810:
g_variant_builder_end: assertion '!GVSB(builder)->uniform_item_types ||
GVSB(builder)->prev_item_type != NULL || g_variant_type_is_definite
(GVSB(builder)->type)' failed

(appstreamcli:17374): GLib-CRITICAL **: 18:30:36.811:
g_variant_new_variant: assertion 'value != NULL' failed

(appstreamcli:17374): GLib-ERROR **: 18:30:36.811: g_variant_new_parsed: 
11-13:invalid GVariant format string
Trace/breakpoint trap

I am not sure whether this recent upgrade is related:
[UPGRADE] libappstream-glib8:amd64 0.7.7-2 -> 0.7.10-1

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: appstream 0.12.0-3
ProcVersionSignature: Ubuntu 4.17.0-6.7-generic 4.17.9
Uname: Linux 4.17.0-6-generic x86_64
ApportVersion: 2.20.10-0ubuntu7
Architecture: amd64
CurrentDesktop: LXQt
Date: Sun Aug 19 18:26:51 2018
InstallationDate: Installed on 2016-01-20 (941 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: appstream
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: appstream (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug cosmic

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https://bugs.launchpad.net/bugs/1787821

Title:
  appstreamcli refresh crashes with glib error

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