575│   changes = builder_cache_get_changes_to (self, root, &removals, NULL);
 576│   metadata_dict = g_variant_dict_new (NULL);
 577├>  g_variant_dict_insert_value (metadata_dict, "changes",
 578│                                g_variant_new_strv ((const gchar * const  *) changes->pdata, changes->len));
 579│   g_variant_dict_insert_value (metadata_dict, "removals",
 580│                                g_variant_new_strv ((const gchar * const  *) removals->pdata, removals->len));
 581│   metadata = g_variant_ref_sink (g_variant_dict_end (metadata_dict));
/usr/src/debug/flatpak-builder-0.10.4-1.fc27.x86_64/src/builder-cache.c
(gdb) p metadata_dict
$11 = (GVariantDict_autoptr) 0x0
(gdb) bt
#0  0x0000555555583566 in builder_cache_commit (self=0x5555557ec8e0 [BuilderCache], body=0x5555558039f0 "Initialized org.mozilla.Firefox
UpstreamBinary\n", error=0x7fffffffde00) at src/builder-cache.c:577
#1  0x000055555556390d in main (argc=<optimized out>, argv=<optimized out>) at src/builder-main.c:659