diff --git a/src/API/Kitsu.php b/src/API/Kitsu.php
index 117f7bdd..11f947c5 100644
--- a/src/API/Kitsu.php
+++ b/src/API/Kitsu.php
@@ -235,7 +235,7 @@ class Kitsu {
 	 * @param array $existingTitles
 	 * @return bool
 	 */
-	private static function titleIsUnique(string $title = null, array $existingTitles): bool
+	private static function titleIsUnique(string $title = null, array $existingTitles = []): bool
 	{
 		if (empty($title))
 		{
diff --git a/src/API/Kitsu/Transformer/MangaListTransformer.php b/src/API/Kitsu/Transformer/MangaListTransformer.php
index cd41809a..81d7bcf4 100644
--- a/src/API/Kitsu/Transformer/MangaListTransformer.php
+++ b/src/API/Kitsu/Transformer/MangaListTransformer.php
@@ -42,11 +42,11 @@ class MangaListTransformer extends AbstractTransformer {
 			? intval(2 * $item['attributes']['rating'])
 			: '-';
 
-		$total_chapters = ($manga['attributes']['chapterCount'] > 0)
+		$totalChapters = ($manga['attributes']['chapterCount'] > 0)
 			? $manga['attributes']['chapterCount']
 			: '-';
 
-		$total_volumes = ($manga['attributes']['volumeCount'] > 0)
+		$totalVolumes = ($manga['attributes']['volumeCount'] > 0)
 			? $manga['attributes']['volumeCount']
 			: '-';
 
@@ -54,11 +54,11 @@ class MangaListTransformer extends AbstractTransformer {
 			'id' => $item['id'],
 			'chapters' => [
 				'read' => $item['attributes']['progress'],
-				'total' => $total_chapters
+				'total' => $totalChapters
 			],
 			'volumes' => [
 				'read' => '-', //$item['attributes']['volumes_read'],
-				'total' => $total_volumes
+				'total' => $totalVolumes
 			],
 			'manga' => [
 				'titles' => Kitsu::filterTitles($manga['attributes']),