fix

room.coffee

@@ -58,7 +58,8 @@ class Room
     bannedplayer = _.find Room.players_banned, (bannedplayer)->
       ip==bannedplayer.ip
     if bannedplayer
-      bannedplayer.time=moment(bannedplayer.time).add(Math.pow(2,bannedplayer.count)*30,'s')
+      bantime=Math.pow(2,bannedplayer.count)*30
+      bannedplayer.time=if moment()<bannedplayer.time then moment(bannedplayer.time).add(bantime,'s') else moment().add(bantime,'s')
       bannedplayer.count=bannedplayer.count+1
       bannedplayer.reason=reason
     else 

room.js

@@ -68,13 +68,14 @@
     Room.players_banned = [];
 
     Room.ban_player = function(name, ip, reason) {
-      var bannedplayer;
+      var bannedplayer, bantime;
       log.info("banned", name, ip, reason);
       bannedplayer = _.find(Room.players_banned, function(bannedplayer) {
         return ip === bannedplayer.ip;
       });
       if (bannedplayer) {
-        bannedplayer.time = moment(bannedplayer.time).add(Math.pow(2, bannedplayer.count) * 30, 's');
+        bantime = Math.pow(2, bannedplayer.count) * 30;
+        bannedplayer.time = moment() < bannedplayer.time ? moment(bannedplayer.time).add(bantime, 's') : moment().add(bantime, 's');
         bannedplayer.count = bannedplayer.count + 1;
         return bannedplayer.reason = reason;
       } else {