diff --git a/bemani/backend/popn/common.py b/bemani/backend/popn/common.py
index 01cf149..81d8355 100644
--- a/bemani/backend/popn/common.py
+++ b/bemani/backend/popn/common.py
@@ -971,12 +971,12 @@ class PopnMusicModernBase(PopnMusicBase, ABC):
 
         game_config = self.get_game_config()
         if game_config.get_bool('force_unlock_songs'):
-            songs = self.data.local.music.get_all_songs(self.game, self.version)
+            songs = {song.id for song in self.data.local.music.get_all_songs(self.game, self.version)}
             for song in songs:
                 item = Node.void('item')
                 root.add_child(item)
                 item.add_child(Node.u8('type', 0))
-                item.add_child(Node.u16('id', song.id))
+                item.add_child(Node.u16('id', song))
                 item.add_child(Node.u16('param', 15))
                 item.add_child(Node.bool('is_new', False))
                 item.add_child(Node.u64('get_time', 0))
diff --git a/bemani/backend/popn/eclale.py b/bemani/backend/popn/eclale.py
index 0253dff..f20772e 100644
--- a/bemani/backend/popn/eclale.py
+++ b/bemani/backend/popn/eclale.py
@@ -704,12 +704,12 @@ class PopnMusicEclale(PopnMusicBase):
 
         game_config = self.get_game_config()
         if game_config.get_bool('force_unlock_songs'):
-            songs = self.data.local.music.get_all_songs(self.game, self.version)
+            songs = {song.id for song in self.data.local.music.get_all_songs(self.game, self.version)}
             for song in songs:
                 item = Node.void('item')
                 root.add_child(item)
                 item.add_child(Node.u8('type', 0))
-                item.add_child(Node.u16('id', song.id))
+                item.add_child(Node.u16('id', song))
                 item.add_child(Node.u16('param', 15))
                 item.add_child(Node.bool('is_new', False))
 
diff --git a/bemani/backend/popn/lapistoria.py b/bemani/backend/popn/lapistoria.py
index c6c80b6..c3c6c30 100644
--- a/bemani/backend/popn/lapistoria.py
+++ b/bemani/backend/popn/lapistoria.py
@@ -741,12 +741,12 @@ class PopnMusicLapistoria(PopnMusicBase):
 
         game_config = self.get_game_config()
         if game_config.get_bool('force_unlock_songs'):
-            songs = self.data.local.music.get_all_songs(self.game, self.version)
+            songs = {song.id for song in self.data.local.music.get_all_songs(self.game, self.version)}
             for song in songs:
                 item = Node.void('item')
                 root.add_child(item)
                 item.add_child(Node.u8('type', 0))
-                item.add_child(Node.u16('id', song.id))
+                item.add_child(Node.u16('id', song))
                 item.add_child(Node.u16('param', 15))
                 item.add_child(Node.bool('is_new', False))