--- a/src/plugins/plugin_misc_room_game.py	Tue Feb 25 22:58:42 2014 +0100
+++ b/src/plugins/plugin_misc_room_game.py	Wed Feb 26 02:13:29 2014 +0100
@@ -86,7 +86,7 @@
         """
         self.host = host
 
-    def _init_(self, host, plugin_info, ns_tag, game_init={}, player_init={}):
+    def _init_(self, host, plugin_info, ns_tag, game_init=None, player_init=None):
         """
         @param host
         @param plugin_info: PLUGIN_INFO map of the game plugin
@@ -98,6 +98,10 @@
         self.name = plugin_info["import_name"]
         self.ns_tag = ns_tag
         self.request = self.REQUEST % (self.MESSAGE, ns_tag[1], ns_tag[0])
+        if game_init is None:
+            game_init = {}
+        if player_init is None:
+            player_init = {}
         self.game_init = game_init
         self.player_init = player_init
         self.games = {}
@@ -257,7 +261,7 @@
         for args, kwargs in sync_args:
             self._sendElements(*args, **kwargs)
 
-    def _getSyncData(self, room_jid_s, force_nicks=[]):
+    def _getSyncData(self, room_jid_s, force_nicks=None):
         """The synchronization data are returned for each player who
         has the state 'desync' or if he's been contained by force_nicks.
         @param room_jid_s: room userhost
@@ -270,6 +274,8 @@
         data = {}
         status = self.games[room_jid_s]['status']
         nicks = [nick for nick in status if status[nick] == 'desync']
+        if force_nicks is None:
+            force_nicks = []
         for nick in force_nicks:
             if nick not in nicks:
                 nicks.append(nick)
@@ -385,7 +391,7 @@
         room = self.host.plugins["XEP-0045"].getUniqueName(muc_service, profile_key=profile_key)
         return "sat_%s_%s" % (self.name.lower(), room) if room != "" else ""
 
-    def prepareRoom(self, other_players=[], room_jid_s=None, profile_key='@NONE@'):
+    def prepareRoom(self, other_players=None, room_jid_s=None, profile_key='@NONE@'):
         """Prepare the room for a game: create it if it doesn't exist and invite players.
         @param other_players: list for other players JID userhosts
         @param room_jid_s: JID userhost of the room, or None to generate a unique name
@@ -396,6 +402,8 @@
         if not profile:
             error(_("Unknown profile"))
             return
+        if other_players is None:
+            other_players = []
 
         def roomJoined(room):
             """@param room: instance of wokkel.muc.Room"""
@@ -509,7 +517,7 @@
             self._initGame(room_jid_s, user_nick)
         return True, False
 
-    def createGame(self, room_jid_s, nicks=[], profile_key='@NONE@'):
+    def createGame(self, room_jid_s, nicks=None, profile_key='@NONE@'):
         """Create a new game - this can be called directly from a frontend
         and skips all the checks and invitation system, but the game must
         not exist and all the players must be in the room already.
@@ -522,6 +530,8 @@
             error(_("profile %s is unknown") % profile_key)
             return
         (create, sync) = self._checkCreateGameAndInit(room_jid_s, profile)
+        if nicks is None:
+            nicks = []
         if not create:
             if sync:
                 self._updatePlayers(room_jid_s, nicks, True, profile)
@@ -573,7 +583,7 @@
             self.send(room_jid, msg_elts, profile=profile)
         if common_data is not None:
             for player in players:
-                players_data[player].update(common_data)
+                players_data[player].update(copy.deepcopy(common_data))
 
     def _createGameElt(self, to_jid):
         """Create a generic domish Element for the game messages