Comm.makeJsonRequest working on simulator but not on watch+phone

hi

my Comm.makeJsonRequest usage in one widget for fenix3 works fine using sdk + simulator.

side loading it to my watch which is paired to my iphone 5 ios 9 with latest connect app does not work.

1 - having connect app running and on phone's screen will let the connect app crash once i initiate the Comm.makeJsonRequest on my watch (i have the enter key make it happen to call the function)
2 - the app on watch does not crash and still works .. continues triggering with watch's enter key will always crash phone connect app
3 - via tcpdump on phone i see no communication attempt

json i expect and which simulator can handle has a size of 8kB.
ios ConnectMobile diagnostic data shows exception type EXC_BAD_ACCESS KERN_INVALID_ADDRESSat 0x00000000

any ideas ?

ciao

----------------8<--------------
...
using Toybox.Communications as Comm;
...
const fhemURL = "192.168.111.40:8083/fhem";
const fhemURLVARIABLECMD = "jsonlist%20c_kodu_balcony_left";
const fhemURLVARIABLES = {"cmd" => fhemURLVARIABLECMD, "XHR" => 1};
const fhemURLMETHOD = Comm.HTTP_REQUEST_METHOD_GET;
...
class fhemModel {
...
function load() {
Comm.makeJsonRequest(fhemURL, fhemURLVARIABLES, {:method => fhemURLMETHOD }, method(:save));
}
...
function save(_responseCode, _data) {
...}
}
...
----------------8<--------------

ciao and tx