Got error 'Trying to get property 'id' of non-object' even dd function return it right - laravel

Question

I have to display data from post table based on user. But, I always get error
Trying to get property 'id' of non-object
even though dd($user) and dd($post) return it right. dd($user) return 1st row, dd($post)return 1st row. When commenting all the 'dd' function , I got 'Trying to get property 'id' of non-object' at $post = post::find($user->id);. However when I dd($post->article_title, $post->id),I do get the data
$RMM = DB::table('companies')->where('branch', 'RMM')->get();
foreach ($RMM as $RMM) {
$user = User::find($RMM->id);
$post = post::find($user->id);
$post_data = array('title' => $post->article_title,
'name' => $post->author,
'date' => date('Y-m-d', strtotime($post->date)),
);
result of dd(post)
result of dd(user)

Answer 1

Be aware, when you dd() something it die at first iteration in foreach, error may occurs in another iterates, maybe id 1 is exists in user but 3 or 4 is not.

Answer 2

use something like this:
$RMM_details = Company::where('branch', 'RMM')->get();
$RMM_details->transform(function($RMM)use($user){
$user = User::find($RMM->id);
$post = post::find($user->id);
return [
'title' => $post->article_title,
'name' => $post->author,
'date' => date('Y-m-d', strtotime($post->date)),
];
});

Answer 3

It might be because
$post = post::find($user->id);
is returning null value at some stances.
Check if it is empty or not by using the function empty and try again.
$RMM = DB::table('companies')->where('branch', 'RMM')->get();
foreach ($RMM as $RMM) {
$user = User::find($RMM->id);
if(!empty($user->id){
$post = post::find($user->id);
}
$post_data = array('title' => $post->article_title,
'name' => $post->author,
'date' => date('Y-m-d', strtotime($post->date)),
);