Problem Detecting Humanoids Workspeed

Im making a Window that Glass can break when u run into it fast enough(I know how to make the Glass Break Script)
Im having trouble trying to get the Humanoids Walkspeed it keeps saying attempt to index nil with WalkSpeed

Script:
local Model = script.Parent

local MainGlass = script.Parent.MainGlass

local BrokenGlass = script.Parent.BrokenGlasses

local debounce = false

local ModelClone = Model:Clone()

ModelClone.Parent = game.ReplicatedStorage

function onTouched(hit)

local human = hit.Parent:findFirstChild(“Humanoid”)

if human.WalkSpeed == 75 then

print(“Fast Enough To Break”)

else

print(“Not Fast Enough Gain more Speed”)

end

end

script.Parent.MainGlass.Touched:Connect(onTouched)

Never Found The Solution shouldnt of been using == used ~= instead