My If statement is not working in Middleware - php

Question

I am trying to make a middleware which can filter my http request by checking if the "$created_by" that I am passing through the request alreday exists in my "users" table
If it does I want to proceed with my "$next($request)"
And if it doesn't I wanna redirect it.
When the situation is this:-
if ($ip->uuid == $request->created_by)
It redirects to $next($request); which is correct
But when the "$request->created_by" is not present in DB it which makes $ip null
And it shows this error "Trying to get property 'uuid' of non-object"
Here's my Middleware:-
<?php
namespace App\Http\Middleware;
use Closure;
use App\User;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
class Posts
{
/**
* Handle an incoming request.
*
* #param \Illuminate\Http\Request $request
* #param \Closure $next
* #return mixed
*/
public function handle($request, Closure $next)
{
$ip = DB::table('users')->where('uuid', '=', $request->created_by)->first();
// dd($ip);
if ($ip->uuid == $request->created_by) {
if ($ip == null) {
return redirect('https://www.google.com');
}
}
return $next($request);
}
}

Answer 1

you can use optional to prevent error if you object is null.
public function handle($request, Closure $next) {
$ip = DB::table('users')->where('uuid', '=', $request->created_by)->first();
if(optional($ip)->uuid == $request->created_by) {
return $next($request);
}
return redirect('https://www.google.com');
}

Answer 2

You have to make sure that $ip is not null before trying to access property uuid.
public function handle($request, Closure $next) {
$ip = DB::table('users')->where('uuid', '=', $request->created_by)->first();
if(is_null($ip) || $ip->uuid !== $request->created_by) {
return redirect('https://www.google.com');
}
return $next($request);
}

Answer 3

Edit:
You already made the comparison in DB, update handle() to be:
public function handle($request, Closure $next)
{
$ip = DB::table('users')->where('uuid', '=', $request->created_by)->first();
if (is_object($ip) {
return $next($request);
}
return redirect('https://www.google.com');
}