Http server error: uncaught exception when creating response to a request

[xagero]

Hello,

i create http server from example code and catch exception.

[Info @ 2016/08/12 18:38:32] HTTP server listening on ***
[Error @ 2016/08/12 18:38:51] Uncaught exception when creating response to a request from *** on * in file _/vendor/icicleio/http/src/Server/Server.php on line 334: A Icicle\Http\Message\Response object was not returned from :onRequest().
[Error @ 2016/08/12 18:38:51] Uncaught exception when creating response to a request from * on * in file _/vendor/icicleio/http/src/Server/Server.php on line 334: A Icicle\Http\Message\Response object was not returned from :onRequest().
[Notice @ 2016/08/12 18:41:05] Error when handling request from *: The stream is no longer readable.

PHP 7.0.8