Lua Error creaturescripts

[adrenyslopez]

help me with this error on my console please?

error:

Lua Script Error: [Scripts Interface]
/home/forgottenserver/data/scripts/creaturescripts/quests/forgotten_knowledge/astral_source.lua:callback
...turescripts/quests/forgotten_knowledge/astral_source.lua:4: attempt to index a nil value
stack traceback:
        [C]: in function '__index'
        ...turescripts/quests/forgotten_knowledge/astral_source.lua:4: in function <...turescripts/quests/forgotten_knowledge/astral_source.lua:2>
> Broadcasted message: "Beware of Tyrn!".
[New Thread 0x7fffe7fff700 (LWP 16317)]
[Thread 0x7fffe7fff700 (LWP 16317) exited]
Reloaded: monster.

Lua Script Error: [Main Interface]
in a timer event called from:
(Unknown scriptfile)
data/lib/core/game.lua:118: table index is nil
stack traceback:
        [C]: in function '__newindex'
        data/lib/core/game.lua:118: in function 'setStorageValue'
        data/lib/core/functions.lua:239: in function <data/lib/core/functions.lua:220>

scripts:

local astralSource = CreatureEvent("AstralSource")
function astralSource.onThink(creature)
    local hp = (creature:getHealth() / creature:getMaxHealth()) * 100
    local health, difference, glyph, pos, sourcePos = 0, 0, Tile(Position(863, 1346, 15)):getTopCreature(), creature:getPosition()
    if hp < 5.5 and Game.getStorageValue(GlobalStorage.ForgottenKnowledge.AstralGlyph) >= 1 then
        sourcePos = creature:getPosition()
                local creatureHealth = creature:getHealth()
        creature:say('Your damage distorted the source and prevents the Glyph to draw on its power.', TALKTYPE_MONSTER_SAY)
        creature:remove()
        local source = Tile(Position(31986, 32823, 15)):getTopCreature()
        if source then
            source:teleportTo(sourcePos)
                        source:addHealth(-(source:getMaxHealth() - creatureHealth))
        end
        local spectators = Game.getSpectators(Position(31986, 32847, 14), false, false, 12, 12, 12, 12)
        for i = 1, #spectators do
            local spec = spectators[i]
            if spec:getName():lower() == 'a shielded astral glyph' then
                health = spec:getHealth()
                difference = glyph:getHealth() - health
                local pos = spec:getPosition()
                spec:teleportTo(Position(31989, 32823, 15))
                glyph:addHealth( - difference)
                glyph:teleportTo(pos)
                glyph:say('Without the power of the source the Glyph loses its protection!', TALKTYPE_MONSTER_SAY)
            end
        end
    elseif Game.getStorageValue(GlobalStorage.ForgottenKnowledge.AstralGlyph) < 1 then
        creature:addHealth(10000, false)
    end
end
astralSource:register()

 

[Leesne]

I've only glanced over the code on mobile and without testing.
I'd say tile doesn't exist and you are calling getTopCreature()

Tile(Position(863, 1346, 15)):getTopCreature()