SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails

Link::create([
            'url' => 'www.netentropy.com',
            'description' => 'ccccc',
            'user_id' => '7'
        ]);

but user id 7 doesn't exist in the dataase.