minor

Author: odeimaiz

services/static-webserver/client/source/class/osparc/study/ConversationPage.js

@@ -178,15 +178,17 @@ qx.Class.define("osparc.study.ConversationPage", {
     },
 
     __updateMessagesNumber: function() {
-      const nMessagesLabel = this.getChildControl("n-messages");
-      const messages = this.getConversation().getMessages();
-      const nMessages = messages.filter(msg => msg.getType() === "MESSAGE").length;
-      if (nMessages === 0) {
-        nMessagesLabel.setValue(this.tr("No Messages yet"));
-      } else if (nMessages === 1) {
-        nMessagesLabel.setValue(this.tr("1 Message"));
-      } else if (nMessages > 1) {
-        nMessagesLabel.setValue(nMessages + this.tr(" Messages"));
+      if (this.getConversation()) {
+        const nMessagesLabel = this.getChildControl("n-messages");
+        const messages = this.getConversation().getMessages();
+        const nMessages = messages.filter(msg => msg.getType() === "MESSAGE").length;
+        if (nMessages === 0) {
+          nMessagesLabel.setValue(this.tr("No Messages yet"));
+        } else if (nMessages === 1) {
+          nMessagesLabel.setValue(this.tr("1 Message"));
+        } else if (nMessages > 1) {
+          nMessagesLabel.setValue(nMessages + this.tr(" Messages"));
+        }
       }
     },
   }