Attempt to compare number < nil

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#1 

function pDM:AddXP(plr,xp)

local exp=DataT[plr.UserId]['XP']
local level=DataT[plr.UserId]['Level']
local prest=DataT[plr.UserId]['Prestige']
exp+=xp
	if exp>pDM.LevelSystem['XP_PER_LEVEL']
			then
				exp=0
					level+=1
				elseif level>pDM.LevelSystem['LEVELS_PER_PRESTIGE'] then
			exp=0
		level=0
	prest+=1
end

end


pDM.LevelSystem={

['MAX_XP_PER_50'] = 40000;
['XP_PER_LEVEL'] = 800;
['LEVELS_PER_PRESTIGE'] = 50;

}

Error: attempt to compare number < nil
Error Line:

elseif level>pDM.LevelSystem['LEVELS_PER_PRESTIGE'] then
#2

DataT[plr.UserId]['Level'] or pDM.LevelSystem['LEVELS_PER_PRESTIGE'] is nil, check which one is nil by using print()

#3

Can you please clarify what DataT is?

#4

The level variable is nil so that would mean your datastore doesnt not have a level stored for that player so you could assign level to 0 if level does not exist

#5

Level or LEVELS_PER_PRESTIGE is nil, there could be an issue when retrieving the data or its just not set.

You need to make sure that DataT contains the player’s UserId entry at the start of the function and that Level and LEVELS_PER_PRESTIGE are not nil.

function pDM:AddXP(plr, xp)
    -- Make sure that DataT contains the player's UserId entry
    if not DataT[plr.UserId] then
        DataT[plr.UserId] = {
            XP = 0,
            Level = 0,
            Prestige = 0
        }
    end
    
    local exp = DataT[plr.UserId]['XP']
    local level = DataT[plr.UserId]['Level']
    local prest = DataT[plr.UserId]['Prestige']
    exp = exp + xp
    
    local levelsPerPrestige = pDM.LevelSystem['LEVELS_PER_PRESTIGE']
    
    if levelsPerPrestige and exp > pDM.LevelSystem['XP_PER_LEVEL'] then
        exp = 0
        level = level + 1
        if level > levelsPerPrestige then
            exp = 0
            level = 0
            prest = prest + 1
        end
    end

    DataT[plr.UserId]['XP'] = exp
    DataT[plr.UserId]['Level'] = level
    DataT[plr.UserId]['Prestige'] = prest
end