anthilld status crashed - java.lang.NumberFormatException: For input string - http.proxyHost

/etc/init.d/anthilld restart

* Caching service dependencies ...                                                                                  [ ok ]

* Starting anthilld ...

Exception in thread "main" java.lang.NumberFormatException: For input string: ""

at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)

at java.lang.Integer.parseInt(Integer.java:592)

at java.lang.Integer.parseInt(Integer.java:615)

at inlein.client.Utils.inleinPort(Utils.java:105)

at inlein.client.ServerConnection.tryConnect(ServerConnection.java:73)

at inlein.client.ServerConnection.ensureConnected(ServerConnection.java:23)

at inlein.client.tasks.StartDaemon.run(StartDaemon.java:20)

at inlein.client.Main.main(Main.java:32)

* Starting inlein server...

* Error starting inlein server                                                                                      [ ok ]

which seems to come from inlein,  and more specifically

String proxyHost = System.getProperty("http.proxyHost");

from https://github.com/hypirion/inlein/blob/master/client/src/inlein/client/Utils.java

what is the expected value? where does it get it ?

thx