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Lua [TFS 1.3] check if a table is nil?

E

Evil Puncker

Guest
Sup everyone, I'm using the amazing raid script by @Nekiro , it works like a charm and all, but it also throws an error and I tried to "fix" that but I don't know where to begin with, so here I am asking for help, follows the script:

Lua: 
local raids = {
    -- Bosses
    [1]  = {type = "BOSS", position = Position(49, 172, 10), monster = "Demodras", message = "Demodras has spawned", chance = 3},
    [2]  = {type = "BOSS", position = Position(115, 88, 7), monster = "Grorlam", message = "Grorlam has spawned", chance = 2},
    [3]  = {type = "BOSS", position = Position(102, 41, 8), monster = "Rotworm Queen", message = "Rotworm Queen has spawned", chance = 2},

    -- Raids fromPos, toPos
    [4] = {type = "NORMAL", fromPos = Position(127, 35, 7), toPos = Position(184, 65, 7), monsters = {"minotaur", "minotaur guard", "minotaur mage", "minotaur archer"}, count = 50, message = "Minotaur assault incoming!", chance = 20},
    [6] = {type = "NORMAL", fromPos = Position(127, 35, 7), toPos = Position(184, 65, 7), monsters = "Feverish Citizen", count = 50, message = "Feverish Citizens have invaded the streets!", chance = 10},
}

local spawnedBosses = {}

local function isSpawned(name)
    for i = 1, #spawnedBosses do
        local monster = Monster(spawnedBosses[i])
        if monster and monster:getName():lower() == name then
            return true
        else
            spawnedBosses[i] = nil
        end
    end
    return false
end

local globalevent = GlobalEvent("SpawnRaid")

function globalevent.onThink(...)
    local table = raids[math.random(#raids)]

    if math.random(100) > table.chance then
        return true
    end

    if table.type == "BOSS" then
        if not isSpawned(table.monster:lower()) then
            local boss = Game.createMonster(table.monster, table.position, true, false)
            if boss then
                spawnedBosses[#spawnedBosses + 1] = boss:getId()
            end
            if table.message ~= nil then
                broadcastMessage(table.message, MESSAGE_EVENT_ADVANCE)
            end
        end
    elseif table.type == "NORMAL" then
        for i = 1, table.count do
            local randomPosition = Position(math.random(table.fromPos.x, table.toPos.x), math.random(table.fromPos.y, table.toPos.y), table.fromPos.z)
            if type(table.monsters) == "string" then
                Game.createMonster(table.monsters, randomPosition, true, false)
            else
                Game.createMonster(table.monsters[math.random(#table.monsters)], randomPosition, true, false)
            end
        end
        if table.message ~= nil then
            broadcastMessage(table.message, MESSAGE_EVENT_ADVANCE)
        end
    end
    return true
end

globalevent:interval(1800000) -- will be executed every 1000ms
globalevent:register()

and the error:
\data\scripts\globalevents\raids.lua:31: attempt to index local 'table' (a nil value)
 
Solution
R
You have raids 1, 2, 3, 4, 6.
You're missing raid #5, either change 6 to 5 or add a new one

The problem is that you have 5 elements in the table, so math.random generates a random number from 1 to 5, so if the random number happens to be 5, it will look for raids[5] which does not exist.
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You have raids 1, 2, 3, 4, 6.
You're missing raid #5, either change 6 to 5 or add a new one

The problem is that you have 5 elements in the table, so math.random generates a random number from 1 to 5, so if the random number happens to be 5, it will look for raids[5] which does not exist.
 
Upvote 0 Downvote
Solution
Evil Puncker said:
Sup everyone, I'm using the amazing raid script by @Nekiro , it works like a charm and all, but it also throws an error and I tried to "fix" that but I don't know where to begin with, so here I am asking for help, follows the script:

Lua: 
local raids = {
    -- Bosses
    [1]  = {type = "BOSS", position = Position(49, 172, 10), monster = "Demodras", message = "Demodras has spawned", chance = 3},
    [2]  = {type = "BOSS", position = Position(115, 88, 7), monster = "Grorlam", message = "Grorlam has spawned", chance = 2},
    [3]  = {type = "BOSS", position = Position(102, 41, 8), monster = "Rotworm Queen", message = "Rotworm Queen has spawned", chance = 2},

    -- Raids fromPos, toPos
    [4] = {type = "NORMAL", fromPos = Position(127, 35, 7), toPos = Position(184, 65, 7), monsters = {"minotaur", "minotaur guard", "minotaur mage", "minotaur archer"}, count = 50, message = "Minotaur assault incoming!", chance = 20},
    [6] = {type = "NORMAL", fromPos = Position(127, 35, 7), toPos = Position(184, 65, 7), monsters = "Feverish Citizen", count = 50, message = "Feverish Citizens have invaded the streets!", chance = 10},
}

local spawnedBosses = {}

local function isSpawned(name)
    for i = 1, #spawnedBosses do
        local monster = Monster(spawnedBosses[i])
        if monster and monster:getName():lower() == name then
            return true
        else
            spawnedBosses[i] = nil
        end
    end
    return false
end

local globalevent = GlobalEvent("SpawnRaid")

function globalevent.onThink(...)
    local table = raids[math.random(#raids)]

    if math.random(100) > table.chance then
        return true
    end

    if table.type == "BOSS" then
        if not isSpawned(table.monster:lower()) then
            local boss = Game.createMonster(table.monster, table.position, true, false)
            if boss then
                spawnedBosses[#spawnedBosses + 1] = boss:getId()
            end
            if table.message ~= nil then
                broadcastMessage(table.message, MESSAGE_EVENT_ADVANCE)
            end
        end
    elseif table.type == "NORMAL" then
        for i = 1, table.count do
            local randomPosition = Position(math.random(table.fromPos.x, table.toPos.x), math.random(table.fromPos.y, table.toPos.y), table.fromPos.z)
            if type(table.monsters) == "string" then
                Game.createMonster(table.monsters, randomPosition, true, false)
            else
                Game.createMonster(table.monsters[math.random(#table.monsters)], randomPosition, true, false)
            end
        end
        if table.message ~= nil then
            broadcastMessage(table.message, MESSAGE_EVENT_ADVANCE)
        end
    end
    return true
end

globalevent:interval(1800000) -- will be executed every 1000ms
globalevent:register()

and the error:
\data\scripts\globalevents\raids.lua:31: attempt to index local 'table' (a nil value)
Click to expand...
Hi,
You have raids table with 5 indexs, when math.random return 5 as value, the index 5 don't exist... Because you only have: [1], [2], [3], [4] and [6]. The index [5] don't exist. Change to this, and will work...

Lua: 
local raids = {
    -- Bosses
    [1]  = {type = "BOSS", position = Position(49, 172, 10), monster = "Demodras", message = "Demodras has spawned", chance = 3},
    [2]  = {type = "BOSS", position = Position(115, 88, 7), monster = "Grorlam", message = "Grorlam has spawned", chance = 2},
    [3]  = {type = "BOSS", position = Position(102, 41, 8), monster = "Rotworm Queen", message = "Rotworm Queen has spawned", chance = 2},

    -- Raids fromPos, toPos
    [4] = {type = "NORMAL", fromPos = Position(127, 35, 7), toPos = Position(184, 65, 7), monsters = {"minotaur", "minotaur guard", "minotaur mage", "minotaur archer"}, count = 50, message = "Minotaur assault incoming!", chance = 20},
    [5] = {type = "NORMAL", fromPos = Position(127, 35, 7), toPos = Position(184, 65, 7), monsters = "Feverish Citizen", count = 50, message = "Feverish Citizens have invaded the streets!", chance = 10},
}

local spawnedBosses = {}

local function isSpawned(name)
    for i = 1, #spawnedBosses do
        local monster = Monster(spawnedBosses[i])
        if monster and monster:getName():lower() == name then
            return true
        else
            spawnedBosses[i] = nil
        end
    end
    return false
end

local globalevent = GlobalEvent("SpawnRaid")

function globalevent.onThink(...)
    local table = raids[math.random(#raids)]

    if math.random(100) > table.chance then
        return true
    end

    if table.type == "BOSS" then
        if not isSpawned(table.monster:lower()) then
            local boss = Game.createMonster(table.monster, table.position, true, false)
            if boss then
                spawnedBosses[#spawnedBosses + 1] = boss:getId()
            end
            if table.message ~= nil then
                broadcastMessage(table.message, MESSAGE_EVENT_ADVANCE)
            end
        end
    elseif table.type == "NORMAL" then
        for i = 1, table.count do
            local randomPosition = Position(math.random(table.fromPos.x, table.toPos.x), math.random(table.fromPos.y, table.toPos.y), table.fromPos.z)
            if type(table.monsters) == "string" then
                Game.createMonster(table.monsters, randomPosition, true, false)
            else
                Game.createMonster(table.monsters[math.random(#table.monsters)], randomPosition, true, false)
            end
        end
        if table.message ~= nil then
            broadcastMessage(table.message, MESSAGE_EVENT_ADVANCE)
        end
    end
    return true
end

globalevent:interval(1800000) -- will be executed every 1000ms
globalevent:register()
 
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