diff --git a/www/common/onlyoffice/main.js b/www/common/onlyoffice/main.js
index d056cad42..6bd6c7df5 100644
--- a/www/common/onlyoffice/main.js
+++ b/www/common/onlyoffice/main.js
@@ -102,9 +102,12 @@ define([
             Cryptpad.onlyoffice.onEvent.reg(function (obj) {
                 if (obj.ev === 'MESSAGE' && !/^cp\|/.test(obj.data)) {
                     try {
+                        var validateKey = obj.data.validateKey || true;
+                        var skipCheck = validateKey === true;
+                        var msg = obj.data.msg;
                         obj.data = {
-                            msg: JSON.parse(Utils.crypto.decrypt(obj.data, Utils.secret.keys.validateKey)),
-                            hash: obj.data.slice(0,64)
+                            msg: JSON.parse(Utils.crypto.decrypt(msg, validateKey, skipCheck)),
+                            hash: msg.slice(0,64)
                         };
                     } catch (e) {
                         console.error(e);
diff --git a/www/common/outer/onlyoffice.js b/www/common/outer/onlyoffice.js
index 3b57b4123..70bc413ec 100644
--- a/www/common/outer/onlyoffice.js
+++ b/www/common/outer/onlyoffice.js
@@ -26,7 +26,10 @@ define([
             if (!c.id) { c.id = chan.wc.myID + '-' + client; }
 
             chan.history.forEach(function (msg) {
-                ctx.emit('MESSAGE', msg, [client]);
+                ctx.emit('MESSAGE', {
+                    msg: msg,
+                    validateKey: chan.validateKey
+                }, [client]);
             });
 
             // ==> And push the new tab to the list
@@ -37,7 +40,8 @@ define([
         var onOpen = function (wc) {
 
             ctx.channels[channel] = ctx.channels[channel] || {
-                history: []
+                history: [],
+                validateKey: obj.validateKey
             };
 
             chan = ctx.channels[channel];
@@ -61,7 +65,10 @@ define([
             });
             wc.on('message', function (msg) {
                 chan.history.push(msg);
-                ctx.emit('MESSAGE', msg, chan.clients);
+                ctx.emit('MESSAGE', {
+                    msg: msg,
+                    validateKey: chan.validateKey
+                }, chan.clients);
             });
 
             chan.wc = wc;
@@ -101,6 +108,7 @@ define([
         };
 
         network.on('message', function (msg, sender) {
+            if (!ctx.channels[channel]) { return; }
             var hk = network.historyKeeper;
             if (sender !== hk) { return; }
 
@@ -115,7 +123,12 @@ define([
             // Keep only metadata messages for the current channel
             if (parsed.channel && parsed.channel !== channel) { return; }
             // Ignore the metadata message
-            if (parsed.validateKey && parsed.channel) { return; }
+            if (parsed.validateKey && parsed.channel) {
+                if (!chan.validateKey) {
+                    chan.validateKey = parsed.validateKey;
+                }
+                return;
+            }
             // End of history: emit READY
             if (parsed.state && parsed.state === 1 && parsed.channel) {
                 ctx.emit('READY', '', chan.clients);
@@ -132,7 +145,9 @@ define([
             if (hash === chan.lastKnownHash || hash === chan.lastCpHash) { return; }
 
             chan.lastKnownHash = hash;
-            ctx.emit('MESSAGE', msg, chan.clients);
+            ctx.emit('MESSAGE', {
+                msg: msg,
+            }, chan.clients);
             chan.history.push(msg);
         });
 
@@ -176,7 +191,9 @@ define([
             return void chan.sendMsg(data.isCp, cb);
         }
         chan.sendMsg(data.msg, cb);
-        ctx.emit('MESSAGE', data.msg, chan.clients.filter(function (cl) {
+        ctx.emit('MESSAGE', {
+            msg: data.msg
+        }, chan.clients.filter(function (cl) {
             return cl !== clientId;
         }));
     };