Anyone know how to fix this? Model:SetPrimaryPartCFrame() failed because no PrimaryPart has been set

Error: Model:SetPrimaryPartCFrame() failed because no PrimaryPart has been set, or the PrimaryPart no longer exists. Please set Model.PrimaryPart before using this.

local RS = game:GetService("ReplicatedStorage")

local Events = RS.Events
local Pets = RS.Pets

local PetCreate = Events.PetCreate

local tab = {}

function CreatePet(player, Index)
local character = player.Character or player.CharacterAdded:Wait()

if character.PrimaryPart:FindFirstChild("Attachment") then
    character.PrimaryPart:FindFirstChild("Attachment"):Destroy()
end

local Pet = Pets[Index]:Clone()

local AttachA = Instance.new("Attachment")
AttachA.Parent = Pet.PrimaryPart

local AttachB = Instance.new("Attachment")
AttachB.Position = Vector3.new(3,3,0)
AttachB.Parent = character.PrimaryPart

local AlignPosition = Instance.new("AlignPosition")
AlignPosition.Attachment0 = AttachA
AlignPosition.Attachment1 = AttachB

local AlignOrientation = Instance.new("AlignOrientation")
AlignOrientation.Attachment0 = AttachA
AlignOrientation.Attachment1 = AttachB

AlignPosition.MaxForce = 30000
AlignOrientation.MaxTorque = 30000

AlignPosition.Parent = Pet.PrimaryPart
AlignOrientation.Parent = Pet.PrimaryPart

Pet:SetPrimaryPartCFrame(character.PrimaryPart.CFrame)
Pet.Parent = workspace
tab[player] = Pet
end

PetCreate.OnServerEvent:Connect(function(player,Index)
if not tab[player] then
    CreatePet(player, Index)
else

    local prevPet = tostring(tab[player])

    tab[player]:Destroy()
    tab[player] = nil

    if prevPet ~= Index then
        CreatePet(player, Index)
    end
end
PetCreate:FireClient(player, tab[player])
end)