cups-browsed SEGFAULTs when cupsEnumDests() returned dest has no "device-uri" option

[sideeffect42]

cups-browsed 1.20.0 crashes when starting up on Gentoo Linux.
I have a CUPS print server in my LAN that advertises printers through DNS-SD.

# cups-browsed --debug
Fri Feb  2 18:20:40 2018 Reading command line option --debug, turning on debug mode (Log on standard error).
Fri Feb  2 18:20:40 2018 cups-browsed of cups-filters version 1.20.0 starting.
Fri Feb  2 18:20:40 2018 Reading config: BrowseRemoteProtocols dnssd
Fri Feb  2 18:20:40 2018 Reading config: CreateIPPPrinterQueues All
Fri Feb  2 18:20:40 2018 No "Browse..." line at all, accept all servers ("BrowseOrder Deny,Allow").
Fri Feb  2 18:20:40 2018 main() in THREAD -1225566704
Fri Feb  2 18:20:40 2018 cups-browsed: Creating http connection to local CUPS daemon: /run/cups/cups.sock:631
Fri Feb  2 18:20:40 2018 update_netifs() in THREAD -1225566704
Fri Feb  2 18:20:40 2018 network interface at 192.168.0.38
Fri Feb  2 18:20:40 2018 cups-browsed [BrowsePoll /run/cups/cups.sock:0]: IPP-Create-Subscription
Fri Feb  2 18:20:40 2018 cups-browsed [BrowsePoll /run/cups/cups.sock:0]: subscription ID=58
Fri Feb  2 18:20:41 2018 cups-browsed (/run/cups/cups.sock): cupsEnumDests
Segmentation fault

I could debug it so far that in cups-browsed.c in get_local_printers(void) when iterating through dests, the device_uri is NULL (for some printers?).
For example:

{
  name = 0x7d714 "HP Deskjet 6940 @ Print-Server", 
  instance = 0x0, 
  is_default = 0, 
  num_options = 5, 
  options = 0x7fbe8 {
    {name = 0x7e2fc "printer-info", value = 0x7d714 "HP Deskjet 6940 @ Print-Server"}, 
    {name = 0x7bccc "printer-location", value = 0x7d904 "Keller"}, 
    {name = 0x7bd1c "printer-make-and-model", value = 0x7014c "HP Deskjet 6943 Printer"}, 
    {name = 0x7d144 "printer-type", value = 0x7d0fc "36894"}, 
    {name = 0x70a4c "printer-uri-supported", value = 0x7e314 "ipps://HP%20Deskjet%206940%20%40%20Print-Server._ipps._tcp.local/cups"}
  }
}

As a result the application segfaults in new_local_printer(device_uri, cups_browsed_controlled) on line 765, because device_uri is NULL

  printer->device_uri = strdup (device_uri);

[tillkamppeter]

Fixed in 3dd9b4. Thank you for your bug report.