I tried to update ActiveMQ 5.5 to 5.6 and discovered a behavioral change if you try to send a message to an invalid queue with stomp. While v5.5 just rejects the message and returns one ERROR frame, v5.6 sends multiple error frames. I'll attach two network captures showing the conversation between client/server in 5.5 and 5.6 - in 5.6 you'll see the repeated error frames. Please let me know if I was unclear of if you need more information. Thanks in advance for any assistance or hint that will help me to get around this problem.