diff --git a/lib/Ebook.php b/lib/Ebook.php
index 0bc5a317..1a269bcf 100644
--- a/lib/Ebook.php
+++ b/lib/Ebook.php
@@ -2354,7 +2354,7 @@ final class Ebook{
 	*
 	* @return array{ebooks: array<Ebook>, ebooksCount: int}
 	*/
-	public static function GetAllByFilter(string $query = null, array $tags = [], Enums\EbookSortType $sort = null, int $page = 1, int $perPage = EBOOKS_PER_PAGE, Enums\EbookReleaseStatusFilter $releaseStatusFilter = Enums\EbookReleaseStatusFilter::All): array{
+	public static function GetAllByFilter(?string $query = null, array $tags = [], ?Enums\EbookSortType $sort = null, int $page = 1, int $perPage = EBOOKS_PER_PAGE, Enums\EbookReleaseStatusFilter $releaseStatusFilter = Enums\EbookReleaseStatusFilter::All): array{
 		$limit = $perPage;
 		$offset = (($page - 1) * $perPage);
 		$orderByRelevance = false;
diff --git a/lib/Exceptions/WebhookException.php b/lib/Exceptions/WebhookException.php
index ed7ef92d..b0fda62e 100644
--- a/lib/Exceptions/WebhookException.php
+++ b/lib/Exceptions/WebhookException.php
@@ -4,7 +4,7 @@ namespace Exceptions;
 class WebhookException extends AppException{
 	public ?string $PostData;
 
-	public function __construct(string $message = '', string $data = null){
+	public function __construct(string $message = '', ?string $data = null){
 		$this->PostData = $data;
 		parent::__construct($message);
 	}