Thread:Extension talk:Scribunto/attempt to call upvalue 'navbar' (a nil value)

I'm seeing the following Script Errors today for some reason. MW 'master' branch and the most currect Module:Navox from WP. You can see this error here: http://elinux.org/Template:Navbox

Lua error in Module:Navbox at line 60: attempt to call upvalue 'navbar' (a nil value). Backtrace: (tail call): ? Module:Navbox:60: in function "renderNavBar" Module:Navbox:116: in function "renderTitleRow" Module:Navbox:323: in function "renderMainTable" Module:Navbox:345: ? (tail call): ? mw.lua:512: ? (tail call): ? [C]: in function "xpcall" MWServer.lua:87: in function "handleCall" MWServer.lua:301: in function "dispatch" MWServer.lua:58: ? (tail call): ? mw.lua:204: ? Module:Arguments:220: ? Module:Documentation:649: in function "_content" Module:Documentation:141: ? (tail call): ? mw.lua:512: ? (tail call): ? [C]: in function "xpcall" MWServer.lua:87: in function "handleCall" MWServer.lua:301: in function "dispatch" MWServer.lua:40: in function "execute" mw_main.lua:7: in main chunk [C]: ?