diff --git a/src/metadata-writer/flacmetata.ts b/src/metadata-writer/flacmetata.ts
index 488a75c..1a9b4aa 100644
--- a/src/metadata-writer/flacmetata.ts
+++ b/src/metadata-writer/flacmetata.ts
@@ -29,26 +29,28 @@ export const writeMetadataFlac = (
     flac.setTag('LYRICS=' + track.LYRICS.LYRICS_TEXT);
   }
 
-  if (track.SNG_CONTRIBUTORS.composer) {
-    flac.setTag('COMPOSER=' + track.SNG_CONTRIBUTORS.composer.join(', '));
-  }
-  if (track.SNG_CONTRIBUTORS.publisher) {
-    flac.setTag('ORGANIZATION=' + track.SNG_CONTRIBUTORS.publisher.join(', '));
-  }
-  if (track.SNG_CONTRIBUTORS.producer) {
-    flac.setTag('PRODUCER=' + track.SNG_CONTRIBUTORS.producer.join(', '));
-  }
-  if (track.SNG_CONTRIBUTORS.engineer) {
-    flac.setTag('ENGINEER=' + track.SNG_CONTRIBUTORS.engineer.join(', '));
-  }
-  if (track.SNG_CONTRIBUTORS.writer) {
-    flac.setTag('WRITER=' + track.SNG_CONTRIBUTORS.writer.join(', '));
-  }
-  if (track.SNG_CONTRIBUTORS.author) {
-    flac.setTag('AUTHOR=' + track.SNG_CONTRIBUTORS.author.join(', '));
-  }
-  if (track.SNG_CONTRIBUTORS.mixer) {
-    flac.setTag('MIXER=' + track.SNG_CONTRIBUTORS.mixer.join(', '));
+  if (track.SNG_CONTRIBUTORS) {
+    if (track.SNG_CONTRIBUTORS.composer) {
+      flac.setTag('COMPOSER=' + track.SNG_CONTRIBUTORS.composer.join(', '));
+    }
+    if (track.SNG_CONTRIBUTORS.publisher) {
+      flac.setTag('ORGANIZATION=' + track.SNG_CONTRIBUTORS.publisher.join(', '));
+    }
+    if (track.SNG_CONTRIBUTORS.producer) {
+      flac.setTag('PRODUCER=' + track.SNG_CONTRIBUTORS.producer.join(', '));
+    }
+    if (track.SNG_CONTRIBUTORS.engineer) {
+      flac.setTag('ENGINEER=' + track.SNG_CONTRIBUTORS.engineer.join(', '));
+    }
+    if (track.SNG_CONTRIBUTORS.writer) {
+      flac.setTag('WRITER=' + track.SNG_CONTRIBUTORS.writer.join(', '));
+    }
+    if (track.SNG_CONTRIBUTORS.author) {
+      flac.setTag('AUTHOR=' + track.SNG_CONTRIBUTORS.author.join(', '));
+    }
+    if (track.SNG_CONTRIBUTORS.mixer) {
+      flac.setTag('MIXER=' + track.SNG_CONTRIBUTORS.mixer.join(', '));
+    }
   }
 
   if (cover) {
diff --git a/src/metadata-writer/id3.ts b/src/metadata-writer/id3.ts
index ab8a3a0..e830c6d 100644
--- a/src/metadata-writer/id3.ts
+++ b/src/metadata-writer/id3.ts
@@ -42,30 +42,31 @@ export const writeMetadataMp3 = (buffer: Buffer, track: trackType, cover?: Buffe
     value: track.DURATION,
   });
 
-  if (track.SNG_CONTRIBUTORS.composer) {
-    writer.setFrame('TXXX', {
-      description: 'COMPOSER',
-      value: track.SNG_CONTRIBUTORS.composer.join(', '),
-    });
-  }
-
-  if (track.SNG_CONTRIBUTORS.writer) {
-    writer.setFrame('TXXX', {
-      description: 'LYRICIST',
-      value: track.SNG_CONTRIBUTORS.writer.join(', '),
-    });
-  }
-  if (track.SNG_CONTRIBUTORS.mixer) {
-    writer.setFrame('TXXX', {
-      description: 'MIXARTIST',
-      value: track.SNG_CONTRIBUTORS.mixer.join(', '),
-    });
-  }
-  if (track.SNG_CONTRIBUTORS.producer && track.SNG_CONTRIBUTORS.engineer) {
-    writer.setFrame('TXXX', {
-      description: 'INVOLVEDPEOPLE',
-      value: track.SNG_CONTRIBUTORS.producer.concat(track.SNG_CONTRIBUTORS.engineer).join(', '),
-    });
+  if (track.SNG_CONTRIBUTORS) {
+    if (track.SNG_CONTRIBUTORS.composer) {
+      writer.setFrame('TXXX', {
+        description: 'COMPOSER',
+        value: track.SNG_CONTRIBUTORS.composer.join(', '),
+      });
+    }
+    if (track.SNG_CONTRIBUTORS.writer) {
+      writer.setFrame('TXXX', {
+        description: 'LYRICIST',
+        value: track.SNG_CONTRIBUTORS.writer.join(', '),
+      });
+    }
+    if (track.SNG_CONTRIBUTORS.mixer) {
+      writer.setFrame('TXXX', {
+        description: 'MIXARTIST',
+        value: track.SNG_CONTRIBUTORS.mixer.join(', '),
+      });
+    }
+    if (track.SNG_CONTRIBUTORS.producer && track.SNG_CONTRIBUTORS.engineer) {
+      writer.setFrame('TXXX', {
+        description: 'INVOLVEDPEOPLE',
+        value: track.SNG_CONTRIBUTORS.producer.concat(track.SNG_CONTRIBUTORS.engineer).join(', '),
+      });
+    }
   }
 
   if (track.LYRICS) {
diff --git a/src/types/tracks.ts b/src/types/tracks.ts
index 7d93138..a5900a7 100644
--- a/src/types/tracks.ts
+++ b/src/types/tracks.ts
@@ -44,7 +44,7 @@ interface songType {
   SMARTRADIO: string; // 0
   SNG_ID: string; // '3135556'
   SNG_TITLE: string; // 'Harder, Better, Faster, Stronger'
-  SNG_CONTRIBUTORS: {
+  SNG_CONTRIBUTORS?: {
     main_artist: string[]; //['Daft Punk']
     author?: string[]; // ['Edwin Birdsong', 'Guy-Manuel de Homem-Christo', 'Thomas Bangalter']
     composer?: string[];