Changes

     local sortKey = stringKey('sort', context, n)

     local sortKey = stringKey('sort', context, n)

     if sortKey then

     if sortKey then

         table.sort(collection, function(a, b) return a[sortKey] and b[sortKey] and a[sortKey] < b[sortKey] end)

         table.sort(collection, function(a, b) return a[sortKey] < b[sortKey] end)

     end

     end

     local i = 1

     local i = 1