ServerScriptService.Script:6: attempt to index local 'humanoid' (a nil value) how to fix ? [closed]

I've been trying to fix this for hours, i'm a beginner at this stuff

LocalScript:

local plr = game:GetService("Players").LocalPlayer

local char = plr.Character or plr.CharacterAdded:wait()

local mouse = plr:GetMouse()

local tool = script.Parent

local anim = tool:FindFirstChild("PunchAnimation")

local Debounce = true

local Damaged = false



char:WaitForChild("LeftHand").Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") and not Debounce and not Damaged and hit.Parent.Humanoid ~= plr.Character.Humanoid then
        if plr.Character.Humanoid.Health > 0 then
            Damaged = true
            game:GetService("ReplicatedStorage").RemoteEvents.punch
:FireServer(hit.Parent.Humanoid)
        end
    end
end)






tool.Equipped:Connect(function()

    print("A tool was equipped")
    mouse.Button1Down:Connect(function()




    print("Tool clicked")
    local hum = tool.Parent:FindFirstChild("Humanoid")
    if hum and Debounce then
        Debounce = false
        anim = hum:LoadAnimation(tool.PunchAnimation)
        anim:Play()
        wait(0.5)
        Debounce = true


    end



end)
end)

ServerScript:

game:GetService("ReplicatedStorage")
.RemoteEvents.punch.OnServerEvent:Connect(function(player, humanoid)

    if humanoid.Health >= 0 then
        humanoid.Health = humanoid.Health - 10
    elseif humanoid.Health < 0 then
        humanoid.Health = 0
    end




end)