Get the highest id from a specific where clause

I have 4 records on my guests database.

I'm trying to query to the guest that has note_display = 1 and have the highest id.

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I've tried

$last_note = DB::table('guests')->where('note_display','=',1)->where('id', DB::raw("(select max(`id`) from guests)"))->first();

I got

Trying to get property of non-object

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I'm a lil stuck now, any hints will be a huge helps ?

via Chebli Mohamed