fix crash

src/socket.io/index.js

@@ -175,15 +175,17 @@ function authorize(socket, callback) {
 			cookieParser(handshake, {}, next);
 		},
 		function(next) {
-			db.sessionStore.get(handshake.signedCookies['express.sid'], next);
-		},
-		function(sessionData, next) {
+			db.sessionStore.get(handshake.signedCookies['express.sid'], function(err, sessionData) {
+				if (err) {
+					return next(err);
+				}
 				if (sessionData && sessionData.passport && sessionData.passport.user) {
 					socket.uid = parseInt(sessionData.passport.user, 10);
 				} else {
 					socket.uid = 0;
 				}	
 				next();
+			});
 		}
 	], callback);
 }