diff --git a/lib/historyKeeper.js b/lib/historyKeeper.js
index 49c199141..bccfef38f 100644
--- a/lib/historyKeeper.js
+++ b/lib/historyKeeper.js
@@ -111,7 +111,7 @@ module.exports.create = function (config, cb) {
             HK.dropChannel(Env, channelName);
         },
         channelOpen: function (Server, channelName, userId) {
-            Env.channel_cache[channelName] = {};
+            Env.channel_cache[channelName] = Env.channel_cache[channelName] || {};
             Server.send(userId, [
                 0,
                 Env.id,