Appium response invalid after response received from instruments is valid - java client ,iOS

Hi
Using appium 1.3.5 , java client , iOS with OS7 & OS8 (real devices).
Objects (mainly on the tabBar ,but not only) - can’t be tapped or identified

Server log in these cases :
info: [debug] Socket data received (40 bytes)
info: [debug] Socket data being routed.
info: [debug] Got result from instruments: {“status”:0,“value”:[{“ELEMENT”:“2”}]}
info: [debug] Responding to client with success: {“status”:0,“value”:[{“ELEMENT”:“2”}],“sessionId”:“d08dc4b9-0b0b-4d5b-b6ce-877f06757726”}
info: <-- POST /wd/hub/session/d08dc4b9-0b0b-4d5b-b6ce-877f06757726/elements 200 975.640 ms - 89 {“status”:0,“value”:[{“ELEMENT”:“2”}],“sessionId”:“d08dc4b9-0b0b-4d5b-b6ce-877f06757726”}
info: --> POST /wd/hub/session/d08dc4b9-0b0b-4d5b-b6ce-877f06757726/timeouts/implicit_wait {“ms”:1000}
info: [debug] Set iOS implicit wait to 1000ms
info: [debug] Responding to client with success: {“status”:0,“value”:null,“sessionId”:“d08dc4b9-0b0b-4d5b-b6ce-877f06757726”}
info: <-- POST /wd/hub/session/d08dc4b9-0b0b-4d5b-b6ce-877f06757726/timeouts/implicit_wait 200 3.066 ms - 76 {“status”:0,“value”:null,“sessionId”:“d08dc4b9-0b0b-4d5b-b6ce-877f06757726”}
info: --> GET /wd/hub/session/d08dc4b9-0b0b-4d5b-b6ce-877f06757726/screenshot {}

after appium client returns null as an answer ,Exception occurs and test can’t continue