try catch statements without try catch. dont know why I did it this way

server/Battle.js

@@ -389,8 +389,12 @@ var Battle = (function(){
   r.userLeft = function(sideName){
     var side = this[sideName];
 
-    side.foe.send("foe:left", null, true);
 
+    if(side.foe){
+      side.foe.send("foe:left", null, true);
+      return;
+    }
+    console.log("side foe not defined!", side.foe);
   }
 
   r.shutDown = function(){

server/Battleside.js

@@ -77,7 +77,13 @@ Battleside = (function(){
     this.receive("decoy:replaceWith", function(data){
       if(self._isWaiting) return;
       var card = self.findCardOnFieldByID(data.cardID);
-      if(card === -1) throw new Error("decoy:replace | unknown card");
+      /*if(card === -1) throw new Error("decoy:replace | unknown card");*/
+      if(card === -1) {
+        console.log("decoy:replace | unknown card: ", card);
+        self.sendNotificationTo(self, "Possible bug occured: unknown card was chosen by playing decoy ability.");
+        //self.endTurn();
+        return;
+      }
       self.runEvent("Decoy:replaceWith", self, [card]);
     })
     this.receive("cancel:decoy", function(){

server/Field.js

@@ -75,8 +75,10 @@ var Field = (function(){
     this._cards[index] = newCard;
     oldCard.reset();
     for(var event in oldCard._uidEvents) {
+      if(this.side && this.side.off){
         this.side.off(event, oldCard.getUidEvents(event));
       }
+    }
     return oldCard;
   }
 
@@ -108,8 +110,10 @@ var Field = (function(){
         return;
       }
       for(var event in card._uidEvents) {
+        if(this.side && this.side.off){
           this.side.off(event, card.getUidEvents(event));
         }
+      }
       this._cards[i] = null;
     }, this)
 
@@ -137,8 +141,10 @@ var Field = (function(){
     cards.forEach(function(card){
       card.reset();
       for(var event in card._uidEvents) {
+        if(this.side && this.side.off){
           this.side.off(event, card.getUidEvents(event));
         }
+      }
       res.push(_cards.splice(self.getPosition(card), 1)[0]);
     })