Found DDNS Luci bug

ddns works fine
luci interface for it too.

but if you go system -> software
and update lists

after that if you swich to sevices -> ddns
you get this

/usr/lib/lua/luci/controller/ddns.lua:116: attempt to index field '?' (a nil value)
stack traceback:
	/usr/lib/lua/luci/controller/ddns.lua:116: in function 'service_version'
	/usr/lib/lua/luci/controller/ddns.lua:126: in function 'service_ok'
	/usr/lib/lua/luci/model/cbi/ddns/overview.lua:20: in function 'func'
	/usr/lib/lua/luci/cbi.lua:66: in function 'load'
	/usr/lib/lua/luci/dispatcher.lua:1340: in function '_cbi'
	/usr/lib/lua/luci/dispatcher.lua:1023: in function 'dispatch'
	/usr/lib/lua/luci/dispatcher.lua:478: in function </usr/lib/lua/luci/dispatcher.lua:477>

only after reboot it get fixed

openwrt 19.07.03