Roblox Studio宠物脚本Argument 1 missing or nil错误排查

Argument 1 missing or nil错误的核心触发原因是客户端调用装备宠物远程事件时未传递宠物名参数，加上代码存在多处拼写不一致、参数漏传问题，共同导致报错。

具体问题清单 #

• 客户端basicEggAnimation脚本的宠物装备点击逻辑中，调用game.ReplicatedStorage.equipPet:FireServer()时没有传入pet.Name参数，服务端接收到的petName值为nil，执行FindFirstChild(nil)直接触发报错。
• 多处命名拼写/大小写不统一，会引发连锁nil错误：
  • 宠物装备状态值混用EquipedPet和EquippedPet两种拼写，访问不存在的属性会返回nil
  • 卸下宠物逻辑中查找对象名错写为player.Name.."'s name"，和实际生成的宠物名player.Name.."'s pet"不匹配
  • equipPet函数定义要求传入3个参数，实际调用时漏传第三个petName参数
  • UI装备状态判断用了大写"EQUIPPED"，但实际设置的文本是首字母大写"Equipped"，会导致状态切换逻辑失效
  • 访问角色相关对象时未做存在性判断，角色未加载完成时会触发报错

修复方案 #

1. 修改basicEggAnimation客户端脚本 #

找到宠物列表按钮点击逻辑块，补全远程事件参数，修正状态判断逻辑：

-- 修正setTemplateEquipped函数，增加传入模板参数
local function setTemplateEquipped(newTemplate)
    for i,v in pairs(scrollingFrame:GetChildren()) do
        if v:FindFirstChild("Equipped") then
            v.Equipped.Text = "UNEQUIPPED"
            v.Equipped.TextColor3 = Color3.fromRGB(255,0,0)
        end
    end
    newTemplate.Equiped.Text = "Equipped"
    newTemplate.Equiped.TextColor3 = Color3.fromRGB(0,255,0)
end

local function addToFrame(pet)
    local newTemplate = template:Clone()
    newTemplate.Name = pet.Name
    newTemplate.petName.Text = pet.Name
    newTemplate.Parent = scrollingFrame
    newTemplate.Visible = true
    local camera = Instance.new("Camera")
    local newPet = pet:Clone()
    newPet.Parent = newTemplate.ViewportFrame
    camera.CFrame = CFrame.new(newPet.PrimaryPart.Position + (newPet.PrimaryPart.CFrame.LookVector * 3), newPet.PrimaryPart.Position)
    camera.Parent = newTemplate.ViewportFrame
    newTemplate.ViewportFrame.CurrentCamera = camera
    buttonConnection[#buttonConnection+1] = newTemplate.MouseButton1Click:Connect(function()
        -- 修正大小写匹配问题
        if newTemplate.Equiped.Text == "Equipped" then
            game.ReplicatedStorage.unequipPet:FireServer()
            newTemplate.Equiped.Text = "UNEQUIPPED"
            newTemplate.Equiped.TextColor3 = Color3.fromRGB(255,0,0)
        else
            -- 补上缺失的pet.Name参数
            game.ReplicatedStorage.equipPet:FireServer(pet.Name)
            setTemplateEquipped(newTemplate)
        end
    end)
end

2. 修改petFollowPlayer服务端脚本 #

统一命名规范，补全参数，增加空值判断：

local function equipPet(player, pet, petName)
    print(player)
    local character = player.Character
    if pet ~= nil and character ~= nil then
        -- 修正宠物名拼写错误
        if character:FindFirstChild(player.Name.."'s pet") then
            character[player.Name.."'s pet"]:Destroy()
        end
        if character.HumanoidRootPart:FindFirstChild("attachmentCharacter") then
            character.HumanoidRootPart:FindFirstChild("attachmentCharacter"):Destroy()
        end
        pet.Name = player.Name.."'s pet"
        pet:SetPrimaryPartCFrame(character.HumanoidRootPart.CFrame)
        local modelSize = pet.PrimaryPart.Size
        local attachmentCharacter = Instance.new("Attachment")
        attachmentCharacter.Visible = false
        attachmentCharacter.Parent = character.HumanoidRootPart
        attachmentCharacter.Position = Vector3.new(-1,0,1) + modelSize
        attachmentCharacter.Name = "attachmentCharacter"
        local attachmentPet = Instance.new("Attachment")
        attachmentPet.Parent = pet.PrimaryPart
        local alignPosition = Instance.new("AlignPosition")
        alignPosition.MaxForce = 25000
        alignPosition.Attachment0 = attachmentPet
        alignPosition.Attachment1 = attachmentCharacter
        alignPosition.Responsiveness = 25
        alignPosition.Parent = pet
        local alignOrientation = Instance.new("AlignOrientation")
        alignOrientation.MaxTorque = 25000
        alignOrientation.Attachment0= attachmentPet
        alignOrientation.Attachment1 = attachmentCharacter
        alignOrientation.Responsiveness = 25
        alignOrientation.Parent = pet
        
        pet.Parent = character
    end
end

game.Players.PlayerAdded:Connect(function(player)
    -- 统一命名为正确拼写的EquippedPet
    local equipedPet = Instance.new("StringValue")
    equipedPet.Name = "EquippedPet"
    equipedPet.Parent = player
    equipedPet.Value = ""
    player.CharacterAdded:Connect(function(char)
        char:WaitForChild("HumanoidRootPart")
        if equipedPet.Value ~= "" and game.ReplicatedStorage:WaitForChild("HatchablePets"):FindFirstChild(equipedPet.Value) then
            local clone =game.ReplicatedStorage:WaitForChild("HatchablePets"):FindFirstChild(equipedPet.Value):Clone()
            -- 补全第三个petName参数
            equipPet(player,clone, equipedPet.Value)
        end
    end)
    equipedPet.Changed:Connect(function ()
        if equipedPet.Value ~= "" and equipedPet.Value ~= nil then
            if game.ReplicatedStorage:WaitForChild("HatchablePets"):FindFirstChild(equipedPet.Value) then
                -- 补全第三个petName参数
                equipPet(player, game.ReplicatedStorage:WaitForChild("HatchablePets"):FindFirstChild(equipedPet.Value):Clone(), equipedPet.Value)
            end
        end
    end)
end)

game.ReplicatedStorage.equipPet.OnServerEvent:Connect(function(player,petName)
    -- 增加petName空值判断，从源头拦截nil报错
    if not petName then return end
    local pet = game.ReplicatedStorage.HatchablePets:FindFirstChild(petName)
    if pet and player:WaitForChild("PetInventory"):FindFirstChild(petName) then
        player.EquippedPet.Value = petName
    end
end)

game.ReplicatedStorage.unequipPet.OnServerEvent:Connect(function(player)
    player.EquippedPet.Value = ""
    -- 增加角色存在性判断
    if player.Character then
        if player.Character:FindFirstChild(player.Name.."'s pet") then
            player.Character[player.Name.."'s pet"]:Destroy()
        end
        if player.Character:FindFirstChild("HumanoidRootPart") and player.Character.HumanoidRootPart:FindFirstChild("attachmentCharacter") then
            player.Character.HumanoidRootPart:FindFirstChild("attachmentCharacter"):Destroy()
        end
    end
end)

内容的提问来源于stack exchange，提问作者Robloxscripter