Roblox Random Material Generator

function RandomMaterial()
    local getRandom;
    local material;
    local function IsTerrainMaterial(mat)
        local isMaterial = pcall(function() workspace:FindFirstChildOfClass'Terrain':GetMaterialColor(mat) end)
        return isMaterial
    end
    getRandom = function()
        local mat = Enum.Material:GetEnumItems()[math.random(1,#Enum.Material:GetEnumItems())]
        if(not IsTerrainMaterial(mat))then material = mat else getRandom() end
    end
    getRandom()
    repeat wait() until material
    return material
end