diff --git a/pyweb/mumble/MumbleCtlDbus.py b/pyweb/mumble/MumbleCtlDbus.py
index 999362b..371a434 100755
--- a/pyweb/mumble/MumbleCtlDbus.py
+++ b/pyweb/mumble/MumbleCtlDbus.py
@@ -84,8 +84,8 @@ class MumbleCtlDbus(MumbleCtlBase):
 	def getPlayers(self, srvid):
 		return MumbleCtlDbus.converDbusTypeToNative(self._getDbusServerObject(srvid).getPlayers())
 
-	def getRegisteredPlayers(self, srvid):
-		return MumbleCtlDbus.converDbusTypeToNative(self._getDbusServerObject(srvid).getRegisteredPlayers(''))
+	def getRegisteredPlayers(self, srvid, filter = ''):
+		return MumbleCtlDbus.converDbusTypeToNative(self._getDbusServerObject(srvid).getRegisteredPlayers( filter ) )
 
 	def getACL(self, srvid, identifier):
 		return MumbleCtlDbus.converDbusTypeToNative(self._getDbusServerObject(srvid).getACL(identifier))
diff --git a/pyweb/mumble/MumbleCtlIce.py b/pyweb/mumble/MumbleCtlIce.py
index 3a19e80..fc32f0f 100755
--- a/pyweb/mumble/MumbleCtlIce.py
+++ b/pyweb/mumble/MumbleCtlIce.py
@@ -84,8 +84,8 @@ class MumbleCtlIce_118(MumbleCtlBase):
 			ret.append(x.id())
 		return ret
 
-	def getRegisteredPlayers(self, srvid):
-		users = self._getIceServerObject(srvid).getRegisteredPlayers('')
+	def getRegisteredPlayers(self, srvid, filter = ''):
+		users = self._getIceServerObject(srvid).getRegisteredPlayers( filter )
 		ret = []
 
 		for user in users:
@@ -260,8 +260,8 @@ class MumbleCtlIce_118(MumbleCtlBase):
 
 
 class MumbleCtlIce_120(MumbleCtlIce_118):
-	def getRegisteredPlayers(self, srvid):
-		users = self._getIceServerObject(srvid).getRegisteredUsers('')
+	def getRegisteredPlayers(self, srvid, filter = ''):
+		users = self._getIceServerObject(srvid).getRegisteredUsers(filter)
 		ret = []
 
 		for user in users:
diff --git a/pyweb/mumble/mctl.py b/pyweb/mumble/mctl.py
index be4cd09..6a744f7 100755
--- a/pyweb/mumble/mctl.py
+++ b/pyweb/mumble/mctl.py
@@ -63,7 +63,7 @@ class MumbleCtlBase ():
 	def getPlayers(self, srvid):
 		pass
 
-	def getRegisteredPlayers(self, srvid):
+	def getRegisteredPlayers(self, srvid, filter):
 		pass
 
 	def getChannels(self, srvid):
diff --git a/pyweb/mumble/models.py b/pyweb/mumble/models.py
index b327472..bfbb52f 100755
--- a/pyweb/mumble/models.py
+++ b/pyweb/mumble/models.py
@@ -251,7 +251,9 @@ class MumbleUser( models.Model ):
 		
 		if self.id is None:
 			# This is a new user record, so Murmur doesn't know about it yet
-			self.mumbleid = ctl.registerPlayer(self.server.srvid, self.name);
+			if len( ctl.getRegisteredPlayers( self.server.srvid, self.name ) ) > 0:
+				raise ValueError( "Another player already registered that name." );
+			self.mumbleid = ctl.registerPlayer( self.server.srvid, self.name );
 		
 		# Update user's registration
 		if self.password: