TCPSocket.close() throws exception

[twistedwings]

TCPSocket.close() throws an exception.

In FF:
ERROR jsiocore No method: _onClose for context Object { _orbitedUri="http://myhost:8080/", readyState=2, more...}
/ERROR net.csp.client application code threw an error. (re-throwing in timeout): ERROR jsiocore No method: _onClose for context [object Object]

In Chrome:
INFO net.env.browser.websocket this._opts
Object
js/Orbited2.js:140ERROR jsiocore No method: _onClose for context
Object
Uncaught ERROR jsiocore No method: _onClose for context [object Object]

Regards,
Jan