Lua error in Module:languages/data/exceptional at line 7104: attempt to concatenate field '?' (a nil value).

Backtrace:

(tail call): ?
Module:languages/data/exceptional:7104: in function "init"
package.lua:103: ?
(tail call): ?
mw.lua:496: in function "executeModule"
mw.lua:768: in function "load_data"
Module:load:39: ?
(tail call): ?
Module:languages:2070: ?
(tail call): ?
Module:parameters:781: ?
(tail call): ?
(tail call): ?
Module:parameters:1081: in function "convert_val"
Module:parameters:1640: in function "process"
Module:labels/templates/show_from:32: in function "chunk"
mw.lua:527: ?
(tail call): ?
[C]: in function "xpcall"
MWServer.lua:99: in function "handleCall"
MWServer.lua:313: in function "dispatch"
MWServer.lua:70: ?
(tail call): ?
mw.lua:196: in function "old_pairs"
...ribunto/includes/engines/LuaCommon/lualib/mwInit.lua:17: in function "pairs"
Module:parameters:1459: ?
(tail call): ?
Module:form_of/templates:675: in function "chunk"
mw.lua:527: ?
(tail call): ?
[C]: in function "xpcall"
MWServer.lua:99: in function "handleCall"
MWServer.lua:313: in function "dispatch"
MWServer.lua:52: in function "execute"
mw_main.lua:7: in main chunk
[C]: ?

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