Version-Release number of selected component:
appstream-0.12.2-1.fc29

Additional info:
reporter:       libreport-2.9.6
backtrace_rating: 4
cmdline:        /usr/bin/appstreamcli refresh --force
crash_function: g_variant_new_parsed_va
executable:     /usr/bin/appstreamcli
journald_cursor: s=7f3e9aa4beec4eb3892179e4771d14d7;i=2968;b=b73145f252684126bb558df11e9a2885;m=15fe1e2a8;t=5780e1739f7be;x=e99181944d4c306a
kernel:         4.18.5-300.fc29.x86_64
rootdir:        /
runlevel:       N 5
type:           CCpp
uid:            0

Truncated backtrace:
Thread no. 1 (10 frames)
 #4 g_variant_new_parsed_va at gvariant-parser.c:2483
 #5 g_variant_builder_add_parsed at gvariant-parser.c:2588
 #6 as_content_rating_to_variant at ../src/as-content-rating.c:510
 #7 as_component_to_variant at ../src/as-component.c:5312
 #8 as_cache_file_save at ../src/as-pool.c:1616
 #9 as_pool_save_cache_file at ../src/as-pool.c:1087
 #10 as_pool_refresh_cache at ../src/as-pool.c:1529
 #11 ascli_refresh_cache at ../tools/ascli-actions-mdata.c:60
 #12 as_client_run_refresh_cache at ../tools/appstream-cli.c:247
 #13 as_client_run at ../tools/appstream-cli.c:818