Connection: guard internal box manipulation

lib/Connection.js

@@ -1107,11 +1107,13 @@ Connection.prototype._resUntagged = function(info) {
   } else if (type === 'recent') {
     if (!this._box && RE_OPENBOX.test(this._curReq.type))
       this._createCurrentBox();
-    this._box.messages.new = info.num;
+    if (this._box)
+      this._box.messages.new = info.num;
   } else if (type === 'flags') {
     if (!this._box && RE_OPENBOX.test(this._curReq.type))
       this._createCurrentBox();
-    this._box.flags = info.text;
+    if (this._box)
+      this._box.flags = info.text;
   } else if (type === 'bad' || type === 'no') {
     if (this.state === 'connected' && !this._curReq) {
       clearTimeout(this._tmrConn);
@@ -1123,18 +1125,22 @@ Connection.prototype._resUntagged = function(info) {
   } else if (type === 'exists') {
     if (!this._box && RE_OPENBOX.test(this._curReq.type))
       this._createCurrentBox();
-    var prev = this._box.messages.total,
-        now = info.num;
-    this._box.messages.total = now;
-    if (now > prev && this.state === 'authenticated') {
-      this._box.messages.new = now - prev;
-      this.emit('mail', this._box.messages.total);
+    if (this._box) {
+      var prev = this._box.messages.total,
+          now = info.num;
+      this._box.messages.total = now;
+      if (now > prev && this.state === 'authenticated') {
+        this._box.messages.new = now - prev;
+        this.emit('mail', this._box.messages.total);
+      }
     }
   } else if (type === 'expunge') {
-    if (this._box.messages.total > 0)
-      --this._box.messages.total;
-    if (!this._curReq)
-      this.emit('expunge', info.num);
+    if (this._box) {
+      if (this._box.messages.total > 0)
+        --this._box.messages.total;
+      if (!this._curReq)
+        this.emit('expunge', info.num);
+    }
   } else if (type === 'ok') {
     if (this.state === 'connected' && !this._curReq)
       this._login();