diff --git a/pyproject.toml b/pyproject.toml
index ac1555cc..f4abab34 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@
 
 [tool.poetry]
     name = "royalnet"
-    version = "5.6.4"
+    version = "5.6.5"
     description = "A multipurpose bot and web framework"
     authors = ["Stefano Pigozzi <ste.pigozzi@gmail.com>"]
     license = "AGPL-3.0+"
diff --git a/royalnet/serf/discord/discordserf.py b/royalnet/serf/discord/discordserf.py
index 690fdafe..d548a3a7 100644
--- a/royalnet/serf/discord/discordserf.py
+++ b/royalnet/serf/discord/discordserf.py
@@ -237,7 +237,7 @@ class DiscordSerf(Serf):
 
             return channels[0]
 
-    def find_voice_player(self, guild: "discord.Guild") -> Optional[VoicePlayer]:
+    def find_voice_players(self, guild: "discord.Guild") -> List[VoicePlayer]:
         candidate_players: List[VoicePlayer] = []
         for player in self.voice_players:
             player: VoicePlayer
@@ -246,4 +246,6 @@ class DiscordSerf(Serf):
             if guild is not None and guild != player.voice_client.guild:
                 continue
             candidate_players.append(player)
-        return candidate_players[0] if len(candidate_players) > 0 else None
+        if guild:
+            assert len(candidate_players) <= 1
+        return candidate_players
diff --git a/royalnet/serf/discord/errors.py b/royalnet/serf/discord/errors.py
index 680e84e8..8afe0cd9 100644
--- a/royalnet/serf/discord/errors.py
+++ b/royalnet/serf/discord/errors.py
@@ -38,5 +38,5 @@ class PlayerNotConnectedError(VoicePlayerError):
     Use :meth:`VoicePlayer.connect` first!"""
 
 
-class PlayerAlreadyPlaying(VoicePlayerError):
+class PlayerAlreadyPlayingError(VoicePlayerError):
     """The :class:`VoicePlayer` is already playing audio and cannot start playing audio again."""
diff --git a/royalnet/serf/discord/voiceplayer.py b/royalnet/serf/discord/voiceplayer.py
index cbcf583d..73a15ba8 100644
--- a/royalnet/serf/discord/voiceplayer.py
+++ b/royalnet/serf/discord/voiceplayer.py
@@ -86,7 +86,7 @@ class VoicePlayer:
         if self.voice_client is None or not self.voice_client.is_connected():
             raise PlayerNotConnectedError()
         if self.voice_client.is_playing():
-            raise PlayerAlreadyPlaying()
+            raise PlayerAlreadyPlayingError()
         log.debug("Getting next AudioSource...")
         next_source: Optional["discord.AudioSource"] = await self.playing.next()
         if next_source is None:
diff --git a/royalnet/version.py b/royalnet/version.py
index e868075a..496196ea 100644
--- a/royalnet/version.py
+++ b/royalnet/version.py
@@ -1 +1 @@
-semantic = "5.6.4"
+semantic = "5.6.5"