Laravel Eloquent在null上调用成员函数getConnection（）

Question

为什么会出现此错误？除了这个

，我的其余查询都有效

    $clients = DB::select(DB::raw('
        SELECT clients.*,users2.* 
        from clients 
        INNER JOIN (
            SELECT 
                users.id,
                users.userdetailsid,
                usermoredetails.address,
                usermoredetails.progbackgroundimage,
                usermoredetails.photo_name,
                usermoredetails.fname,
                usermoredetails.lname,
                usermoredetails.mname,
                usermoredetails.mobilenumber,
                usermoredetails.email,
                usermoredetails.gender,
                usermoredetails.civilstatus,
                usermoredetails.addedby
            FROM users
            INNER JOIN usermoredetails ON usermoredetails.id = users.userdetailsid 
            LIMIT 1
        ) AS users2 on users2.id = clients.userid
        where clients.active = 1'));

但是如果通过phpmyadmin运行查询，它可以正常工作。哪里出错了？ 有人能帮助我吗？