Trying to get property of non-object when trying to print

When i am print dd it's showing all data. But when i'm trying to echo it's return error

trying to get property of non-object

Why?

$r = DB::table('requisition_items')->where('material_id', $row->id)->orderBy('id','desc')->first();
                            //dd($r);
                            echo $r->status;

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