Only add an album if it doesn’t yet exist.

diff --git a/src/main/java/net/pterodactylus/sone/data/Album.java b/src/main/java/net/pterodactylus/sone/data/Album.java
index 0abc59c..e3b33de 100644 (file)
--- a/src/main/java/net/pterodactylus/sone/data/Album.java
+++ b/src/main/java/net/pterodactylus/sone/data/Album.java
@@ -125,8 +125,10 @@ public class Album implements Fingerprintable {
         */
        public void addAlbum(Album album) {
                Validation.begin().isNotNull("Album", album).check().isEqual("Album Owner", album.sone, sone).isEither("Old Album Parent", this.parent, null, album.parent).check();
-               albums.add(album);
                album.setParent(this);
+               if (!albums.contains(album)) {
+                       albums.add(album);
+               }
        }
 
        /**