Package: fwupd Version: 1.5.7-4 On one machine (this may be hardware-dependent; the system in question is a Dell Precision 3450 with BIOS version 1.2.3) fwupd logs the message
GLib g_bytes_get_data: assertion 'bytes != NULL' failed exactly 16 times, twice a day (coinciding with activations of fwupd-refresh.service, regardless of whether new metadata is available). I guess this means that some calls to g_bytes_get_data() are missing a guard against the possibility that the first argument is null. (The second argument is allowed to be null according to the documentation and isn't called "bytes".)