google cloud messaging - Android Background Runnable not working on older devices -

i have following running @ startup inside of intentservice

threadmanager.postbackgroundrunnabledelayed(() -> {             try {                 // calling gettoken , getid must on separate thread. otherwise, blocks ui thread.                 string token = instanceid.gettoken(sender_id, googlecloudmessaging.instance_id_scope);                 string id = instanceid.getid();                 timber.d("id: " + id);                 timber.d("token: " + token);                 lazyrestqueue.get().sendgcmtoken(new gcmpushrequest(id, token), getsendgcmtokencallback());                 setupanalytics(token);             } catch (ioexception e) {                 timber.e(e, "exception during registration");                 crashlytics.logexception(e);                 sethastoken(false);             } catch (runtimeexception e) {                 // thrown if localytics not setup                 timber.e(e, "exception during registration");             }         }); 

when run on below api 18 causes app close (not crash oddly, close)

can give me advice on this? know has service or not timing