Change value inside pagination data

Hey, I need to cycle through pagination data and change a value based on a condition, but I'm getting this error: Type error: Argument 1 passed to Illuminate\Database\Grammar::columnize() must be of the type array, string given

HouseController:

<?php

namespace App\Http\Controllers;

use Illuminate\Pagination\Paginator;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\DB;

class HouseController extends Controller
{
    public function index()
    {
        if(request('town')) {
            $this->validate(
                request(),
                [
                    'town' => 'string|in:' . implode(',', config('aac.towns')),
                ],
                [
                    '*.string' => 'Town can only be a string.',
                    '*.in' => 'Unknown town.'
                ]
            );
            $town = request('town');
        }
            else $town = config('aac.towns.' . config('aac.houses.defaultHouselistTown'));

        $town_id = array_search($town, config('aac.towns'));

        if(request('orderBy')) {
            $this->validate(
                request(),
                [
                    'orderBy' => 'string|in:name,size,beds,rent,owner',
                ],
                [
                    'orderBy' => 'You can only order by: name, size, beds, rent, owner'
                ]
            );
            $orderBy = request('orderBy');
        }
        else $orderBy = 'name';

        if(request('order')) {
            $this->validate(
                request(),
                [
                    'order' => 'string|in:desc,asc'
                ],
                [
                    'order.string' => 'You can only use asc or desc order.',
                ]
            );
            $order = request('order');
        }
        else $order = 'desc';

        $currentPage = request('page') ? request('page') : 1;

//        dd($order, $orderBy, $town, $town_id);
        $data = Cache::remember('houses_' . $town . '_' . $orderBy . '_' . $order . '_' . $currentPage, 1, function () use ($town, $orderBy, $order, $town_id, $currentPage) {
            $houses = DB::table('houses')
                ->where('town_id', $town_id)
                ->orderBy($orderBy, $order)
                ->select('id', 'name', 'size', 'beds', 'rent', 'owner')
                ->paginate(15);
            foreach($houses as $house) {
                if ($house->owner != '0')
                    $house->owner = DB::table('players')->where('id', $house->owner)->first('name');
            }
            Paginator::currentPageResolver(function () use ($currentPage) {
                return $currentPage;
            });
            return $houses;
        });
        return view('houses', [
            'houses' => $data,
            'town' => $town,
            'orderBy' => $orderBy,
            'order' => $order
        ]);
    }
}