diff --git a/.github/workflows/run-macos.yml b/.github/workflows/run-macos.yml
index d75f7e3..8214aab 100644
--- a/.github/workflows/run-macos.yml
+++ b/.github/workflows/run-macos.yml
@@ -22,22 +22,23 @@ jobs:
         run: |
           /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
           brew update
+          brew upgrade
           brew install p7zip rar ghostscript
           brew install imagemagick
         shell: bash
 
-      - name: Add rar extension
-        run: |
-          git clone https://github.com/cataphract/php-rar
-          cd php-rar
-          phpize
-          ./configure
-          sudo make
-          sudo make install
-          pecl_path=$(pecl config-get ext_dir)
-          phpini_path=$(php -i | grep /.+/php.ini -oE)
-          sudo cp ./modules/rar.so $pecl_path
-          sudo echo "extension=rar.so" > $phpini_path
+      # - name: Add rar extension
+      #   run: |
+      #     git clone https://github.com/cataphract/php-rar
+      #     cd php-rar
+      #     phpize
+      #     ./configure
+      #     sudo make
+      #     sudo make install
+      #     pecl_path=$(pecl config-get ext_dir)
+      #     phpini_path=$(php -i | grep /.+/php.ini -oE)
+      #     sudo cp ./modules/rar.so $pecl_path
+      #     sudo echo "extension=rar.so" > $phpini_path
 
       - name: Setup problem matchers
         run: |
@@ -47,8 +48,8 @@ jobs:
       - name: Install dependencies
         run: composer update --prefer-dist --no-interaction
 
-      - name: Check extension rar
-        run: php -m | grep rar
+      # - name: Check extension rar
+      #   run: php -m | grep rar
 
       - name: Check extension imagick
         run: php -m | grep imagick
diff --git a/composer.json b/composer.json
index e99a5db..31069ab 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "kiwilan/php-ebook",
     "description": "PHP package to read metadata and extract covers from eBooks, comics and audiobooks.",
-    "version": "2.6.7",
+    "version": "2.6.8",
     "keywords": [
         "php",
         "ebook",
diff --git a/src/Formats/Audio/AudiobookModule.php b/src/Formats/Audio/AudiobookModule.php
index fe3ee6c..e64c8f3 100644
--- a/src/Formats/Audio/AudiobookModule.php
+++ b/src/Formats/Audio/AudiobookModule.php
@@ -39,7 +39,11 @@ private function create(): self
         $authors = $audio->getArtist() ?? $audio->getAlbumArtist();
 
         $genres = EbookUtils::parseStringWithSeperator($audio->getGenre());
-        $genres = array_map('ucfirst', $genres);
+        if (! is_array($genres)) {
+            $genres = null;
+        } else {
+            $genres = array_map('ucfirst', $genres);
+        }
 
         $series = $audio->getTag('series') ?? $audio->getTag('mvnm');
         $series_part = $audio->getTag('series-part') ?? $audio->getTag('mvin');
diff --git a/src/Formats/Epub/Parser/EpubHtml.php b/src/Formats/Epub/Parser/EpubHtml.php
index 903f6c0..2356960 100644
--- a/src/Formats/Epub/Parser/EpubHtml.php
+++ b/src/Formats/Epub/Parser/EpubHtml.php
@@ -15,7 +15,7 @@ class EpubHtml
 
     public static function make(?string $html, ?string $filename): self
     {
-        $self = new self();
+        $self = new self;
 
         if (! $html || ! $filename) {
             return $self;
diff --git a/src/Formats/Epub/Parser/NcxItem.php b/src/Formats/Epub/Parser/NcxItem.php
index 4664084..7e04c7f 100644
--- a/src/Formats/Epub/Parser/NcxItem.php
+++ b/src/Formats/Epub/Parser/NcxItem.php
@@ -165,7 +165,7 @@ protected function __construct(
 
     public static function make(array $xml): self
     {
-        $self = new self();
+        $self = new self;
         $self->name = $xml['name'] ?? null;
         $self->content = $xml['content'] ?? null;
 
@@ -203,7 +203,7 @@ protected function __construct(
 
     public static function make(array $xml): self
     {
-        $self = new self();
+        $self = new self;
 
         $self->label = $xml['navLabel']['text'] ?? null;
         $self->src = $xml['content']['@attributes']['src'] ?? null;
diff --git a/src/Formats/Mobi/Parser/MobiParser.php b/src/Formats/Mobi/Parser/MobiParser.php
index fe337fc..13bd959 100644
--- a/src/Formats/Mobi/Parser/MobiParser.php
+++ b/src/Formats/Mobi/Parser/MobiParser.php
@@ -81,7 +81,7 @@ private function parse(): self
             $this->palmRecords[] = $record;
         }
 
-        $this->palmDOCHeader = new PalmDOCHeader();
+        $this->palmDOCHeader = new PalmDOCHeader;
         $this->stream->seek($this->palmRecords[0]->offset);
         $this->palmDOCHeader->compression = $this->stream->binaryToDecimal($this->stream->read(2));
         $this->stream->read(2);
diff --git a/tests/AudiobookTest.php b/tests/AudiobookTest.php
index a2bed52..986c744 100644
--- a/tests/AudiobookTest.php
+++ b/tests/AudiobookTest.php
@@ -101,3 +101,9 @@
 
     expect($ebook->getVolume())->toBe(0);
 });
+
+it('can parse audiobook without genres', function () {
+    $ebook = Ebook::read(AUDIOBOOK_EWILAN_NO_GENRES);
+
+    expect($ebook->getTags())->toBeEmpty();
+});
diff --git a/tests/Pest.php b/tests/Pest.php
index 200c654..28f677f 100644
--- a/tests/Pest.php
+++ b/tests/Pest.php
@@ -61,6 +61,7 @@
 define('AUDIOBOOK_CHAPTERS', __DIR__.'/media/audiobook-test.m4b');
 define('AUDIOBOOK_EWILAN_VOLUME', __DIR__.'/media/audiobook-ewilan-volume.m4b');
 define('AUDIOBOOK_EWILAN_VOLUME_ZERO', __DIR__.'/media/audiobook-ewilan-volume-0.m4b');
+define('AUDIOBOOK_EWILAN_NO_GENRES', __DIR__.'/media/audiobook-ewilan-no-genres.m4b');
 
 define('FORMAT_AZW3', __DIR__.'/media/alice-lewis-carroll.azw3');
 define('FORMAT_DOCX', __DIR__.'/media/alice-lewis-carroll.docx');
diff --git a/tests/media/audiobook-ewilan-no-genres.m4b b/tests/media/audiobook-ewilan-no-genres.m4b
new file mode 100644
index 0000000..9046b3c
Binary files /dev/null and b/tests/media/audiobook-ewilan-no-genres.m4b differ