diff --git a/src/stomp.coffee b/src/stomp.coffee
index 69788a9..d217faf 100644
--- a/src/stomp.coffee
+++ b/src/stomp.coffee
@@ -189,7 +189,8 @@ class Client
     # heart-beat header received from the server looks like:
     #
     #     heart-beat: sx, sy
-    [serverOutgoing, serverIncoming] = (parseInt(v) for v in headers['heart-beat'].split(","))
+    [serverOutgoing, serverIncoming] =
+      if headers['heart-beat']? then (parseInt(v) for v in headers['heart-beat'].split(",")) else [0, 0]
 
     unless @heartbeat.outgoing == 0 or serverIncoming == 0
       ttl = Math.max(@heartbeat.outgoing, serverIncoming)