ClusterSSH runtime errors

[Dave]

ClusterSSH is continuously generating the following while running.
On at least one occasion I cam back to find all the client xterms
closed.  Maybe the error counter overflowed and crashed it?

Tk::Error: Can't use an undefined value as a symbol reference at /usr/local/lib/perl5/site_perl/App/ClusterSSH.pm line 1457.
 Tk::After::repeat at /usr/local/lib/perl5/site_perl/mach/5.24/Tk/After.pm line 80
 [repeat,[{},after#23481,500,repeat,[\&App::ClusterSSH::__ANON__]]]
 ("after" script)
XS_Tk__Callback_Call error:Can't use an undefined value as a symbol reference at /usr/local/lib/perl5/site_perl/App/ClusterSSH.pm line 1457.


uname -a
FreeBSD laptop 10.3-RELEASE-p24 FreeBSD 10.3-RELEASE-p24 #0: Wed Nov 15 04:57:40 UTC 2017     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64

pkgs/ports up to date as of about an hour ago.