https://devzone.nordicsemi.com/f/nordic-q-a/17543/in-s310-after-ant-chanell-closed-the-ble-crash-to-advertisehi its first in this event on_ant_evt_channel_closed and then storage_access_complete_handler(); then it try to advertise by this sd_ble_gap_adv_start and then it is in app_error_handler and the error code is 536881920 anden-USTelligent Community 13Mon, 07 Nov 2016 13:45:43 GMThttps://devzone.nordicsemi.com/thread/67457?ContentTypeID=1Mon, 07 Nov 2016 13:45:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:32a6dd91-a3ff-41c4-a08d-230f865b3e3dPetter Myhre<p>Isn&#39;t this a <a href="https://devzone.nordicsemi.com/question/101803/error-code-is-536881912/">duplicate</a>? I don&#39;t think that is a valid error code. Have you turned off optimizations? Are you trying to start connectable advertising while you are in a connection? Then sd_ble_gap_adv_start() will return NRF_ERROR_INVALID_STATE</p><div style="clear:both;"></div>