bus method call error process

[Deng Tyler]

Hi all:
    I create my bus service and try to use bus method call to get some property from other bus service. But I encounter a bus call issue that my service suspended if I try to make a method call with a non active service. For example:
…
method = bus.new_method_call(“non-active service”, obj, interface, method);
reply = bus.call(method);
#service suspended here…
if(reply)….
…

Could someone help to give a hint??
Thanks.