One ammo pack works but the other one doesnt??? [SOLVED]

Uhh so i made an ammo pack script for turbofusion guns, works perfectly with the sniper rifle i made. The problem here is that it doesnt work with other weapons.

Output

19:05:18.937 - Humanoid is not a valid member of Tool

19:05:18.938 - Stack Begin

19:05:18.938 - Script 'Workspace.ammopile_SMG.GiveAmmo', Line 6

19:05:18.939 - Stack End

Script

local ammoPickup = 30
local bundleType = "SMG"
local ammoLeft = 180
local canPickup = true
script.Parent.Touched:connect(function(hit)
	if hit.Parent.Humanoid then --checks if hit.parent has an humanoid item
		local find = hit.Parent:FindFirstChildOfClass("Tool") --if it has one, it searches for a tool that he currently uses
		if find then
			local find2 = find:FindFirstChild("AmmoType") --then if he does, checks if this item has the AmmoType stringvalue
			if find2 then
				local find3 = find:FindFirstChild("Gun_Main") --if it does again, it searches for the Gun_Main localscript to determine if the tool is actually a gun (works with turbofusion kit only for now)
				if find3 then
					if find2.Value == bundleType then
						local find4 = find2.Parent:FindFirstChild("StoredAmmo") --searches for the StoredAmmo intvalue
						if find4 then
							if ammoLeft > 1  and canPickup == true then
								canPickup = false
								script.Parent.PickupSound:Play()
								find4.Value = find4.Value + ammoPickup
								ammoLeft = ammoLeft - ammoPickup
								wait(2)
								canPickup = true
							end
						end 
					end
				end
			end
		end
	end
end)

while true do
	wait(0.1)
	if ammoLeft < 0 then
		ammoLeft = 0
	end
end

Please, do you know what's causing this? i do get ammo when i use the sniper rifle, but it spams my console when i try with the SMG.