Hi,

A temporary workaround you can use is to unbind the sendMessage handler from the messageBox of the chat as demonstrated in the example below:

• https://dojo.telerik.com/@pmilchev/IjUtoQiG 

•   function sendMessageHandler(e) {
                  console.log("Message sent: " + e.text);
              }
              var chat = $("#chat").kendoChat({
                  sendMessage: sendMessageHandler
              }).getKendoChat();
          
              chat.messageBox.unbind("sendMessage", sendMessageHandler);

Regards,
Peter Milchev
Progress Telerik