AR Invoice Entry Error on Udate with no due-by date

[sbts]

Adding a new invoice, with the "first" customer selected in the dropdown and no Due Date
Hitting Update throws the below error

Expected behavior is to populate the due date

'The 'month' parameter ("13") to DateTime::new did not pass the 'an integer between 1 and 12' callback at /usr/lib/x86_64-linux-gnu/perl5/5.20/DateTime.pm line 197. DateTime::new(undef, "month", 13, "day", 10, "year", 2017) called at /srv/ledgersmb/tools/../lib/LedgerSMB/PGDate.pm line 199 LedgerSMB::PGDate::new("LedgerSMB::PGDate", "month", 13, "day", 10, "year", 2017) called at /srv/ledgersmb/tools/../lib/LedgerSMB/PGDate.pm line 272 LedgerSMB::PGDate::from_input("LedgerSMB::PGDate", "13/10/2017") called at /srv/ledgersmb/tools/../bin/is.pl line 1125 lsmb_legacy::update called at /srv/ledgersmb/tools/../bin/old-handler.pl line 167 lsmb_legacy::try {...} () called at /usr/share/perl5/Try/Tiny.pm line 81 eval {...} called at /usr/share/perl5/Try/Tiny.pm line 72 Try::Tiny::try(CODE(0xe983f40), Try::Tiny::Catch=REF(0xecb2490)) called at /srv/ledgersmb/tools/../bin/old-handler.pl line 183 require bin/old-handler.pl called at /srv/ledgersmb/tools/../lib/LedgerSMB/PSGI.pm line 110 LedgerSMB::PSGI::try {...} () called at /usr/share/perl5/Try/Tiny.pm line 81 eval {...} called at /usr/share/perl5/Try/Tiny.pm line 72 Try::Tiny::try(CODE(0x9b10fc0)) called at /srv/ledgersmb/tools/../lib/LedgerSMB/PSGI.pm line 116 LedgerSMB::PSGI::_run_old() called at /srv/ledgersmb/tools/../lib/LedgerSMB/PSGI.pm line 74 LedgerSMB::PSGI::ANON() called at /usr/share/perl5/CGI/Emulate/PSGI.pm line 29 CGI::Emulate::PSGI::ANON(HASH(0xeb49820)) called at /usr/share/perl5/Plack/App/URLMap.pm line 71 Plack::App::URLMap::call(Plack::App::URLMap=HASH(0x9ca84c0), HASH(0xeb49820)) called at /usr/share/perl5/Plack/Component.pm line 50 Plack::Component::ANON(HASH(0xeb49820)) called at /srv/ledgersmb/tools/starman.psgi line 72 LedgerSMB::FCGI::ANON(HASH(0xeb49820)) called at /usr/share/perl5/Plack/Middleware/Conditional.pm line 16 Plack::Middleware::Conditional::call(Plack::Middleware::Conditional=HASH(0x9cb7028), HASH(0xeb49820)) called at /usr/share/perl5/Plack/Component.pm line 50 Plack::Component::ANON(HASH(0xeb49820)) called at /usr/share/perl5/Plack/Util.pm line 142 eval {...} called at /usr/share/perl5/Plack/Util.pm line 142 Plack::Util::run_app(CODE(0x9cb6f80), HASH(0xeb49820)) called at /usr/share/perl5/Starman/Server.pm line 281 Starman::Server::process_request(Starman::Server=HASH(0x20c4ed0), Net::Server::Proto::TCP=GLOB(0xe970260)) called at /usr/share/perl5/Net/Server.pm line 74 Net::Server::run_client_connection(Starman::Server=HASH(0x20c4ed0)) called at /usr/share/perl5/Net/Server/PreFork.pm line 229 eval {...} called at /usr/share/perl5/Net/Server/PreFork.pm line 229 Net::Server::PreFork::run_child(Starman::Server=HASH(0x20c4ed0)) called at /usr/share/perl5/Net/Server/PreFork.pm line 187 Net::Server::PreFork::run_n_children(Starman::Server=HASH(0x20c4ed0), 5) called at /usr/share/perl5/Net/Server/PreFork.pm line 111 Net::Server::PreFork::loop(Starman::Server=HASH(0x20c4ed0)) called at /usr/share/perl5/Net/Server.pm line 60 Net::Server::run(Starman::Server=HASH(0x20c4ed0), "port", ARRAY(0xa0e38d0), "host", "*", "proto", "tcp", "serialize", "none", ...) called at /usr/share/perl5/Starman/Server.pm line 89 Starman::Server::run(Starman::Server=HASH(0x20c4ed0), CODE(0x9cb6f80), HASH(0x9c9c1d8)) called at /usr/share/perl5/Plack/Handler/Starman.pm line 18 Plack::Handler::Starman::run(Plack::Handler::Starman=HASH(0x20e1bb0), CODE(0x9cb6f80)) called at /usr/share/perl5/Plack/Loader.pm line 84 Plack::Loader::run(Plack::Loader=HASH(0x200f430), Plack::Handler::Starman=HASH(0x20e1bb0)) called at /usr/share/perl5/Plack/Runner.pm line 277 Plack::Runner::run(Plack::Runner=HASH(0x1d6a830)) called at /usr/bin/starman line 38 '