xcode - Swift fatal error: Array index out of range -

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i'm creating game small project , i'm trying make after ever 5 points walls generate more when playing game, crashes @ reaching around 24 points the error "fatal error: array index out of range"

gamescene.swift 

 if pointslabel.number % knumberofpointsperlevel == 0 {                     currentlevel++                     wallgenerator.stopgenerating()                     wallgenerator.startgeneratingwallsevery(klevelgenerationtimes[currentlevel])                 }

constants.swift

let knumberofpointsperlevel = 5 let klevelgenerationtimes: [nstimeinterval] = [1.0, 0.8, 0.6, 0.4, 0.3]

it looks error here:

wallgenerator.startgeneratingwallsevery(klevelgenerationtimes[currentlevel])

when currentlevel equal or greater number of elements in klevelgenerationtimes.

i don't know correct solution is, depending on game logic - propose 2 versions, first restarting first element of array once end reached:

wallgenerator.startgeneratingwallsevery(klevelgenerationtimes[currentlevel % klevelgenerationtimes.count])

whereas second use last element of array (i take increasing complexity player progresses):

let index = currentlevel < klevelgenerationtimes.count ? currentlevel : klevelgenerationtimes.count - 1 wallgenerator.startgeneratingwallsevery(klevelgenerationtimes[index])

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