TFS 1.X+ Doubt using and or in lua

[roriscrave]

the error is in this line

Premium: " .. player:isPremium() and 'Is' or 'Not' ..

How can i solve this line error?

function onSay(player, words, param)

    player:popupFYI("Player Info!" ..
    "\nInitial Information: " ..
    "\nNick: " .. player:getName() ..
    "\nLevel: " .. player:getLevel() ..
    "\nPremium: " .. player:isPremium() and 'Is' or 'Not' ..
    "")

    return true
end

error:

Lua Script Error: [TalkAction Interface]
data/talkactions/scripts/info.lua:onSay
data/talkactions/scripts/info.lua:9: attempt to concatenate a boolean value
stack traceback:
        [C]: in function '__concat'
        data/talkactions/scripts/info.lua:9: in function <data/talkactions/scripts/info.lua:3>

 

[Infernum]

wrap player:isPremium() and 'Is' or 'Not' in parentheses

 

[roriscrave]

wrap player:isPremium() and 'Is' or 'Not' in parentheses

that hard, and I almost an hour in this shit