Error on "when CLIENT_ACCEPTED" IRule

I suspected a bug with TCP::local_port ...

i did not get an error.

 config

[root@ve11a:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when CLIENT_ACCEPTED {
  log local0. ""
  switch [TCP::local_port] {
    1423 {
      set idle 3600
      IP::idle_timeout 3600
    }
    default {
      set idle 300
      IP::idle_timeout 300
    }
  }
}
when SERVER_CONNECTED {
  log local0. ""
  IP::idle_timeout $idle
}
}

 /var/log/ltm

[root@ve11a:Active:In Sync] config  tail -f /var/log/ltm
Sep  5 08:27:39 ve11a info tmm[15094]: Rule /Common/qux CLIENT_ACCEPTED:
Sep  5 08:27:39 ve11a info tmm[15094]: Rule /Common/qux SERVER_CONNECTED: