Null pointer exception while turning off bluetooth. about android-ble-library HOT 8 CLOSED

	final void onCharacteristicWriteSafe(@NonNull final BluetoothGatt gatt,
										 @NonNull final BluetoothGattCharacteristic characteristic,
										 @Nullable final byte[] data,
										 final int status) {
		if (status == BluetoothGatt.GATT_SUCCESS) {
			log(Level.INFO, "Data written to " + characteristic.getUuid() +
					", value: " + ParserUtils.parse(data));

			onCharacteristicWrite(gatt, characteristic);
			final WriteRequest request = (WriteRequest) mRequest;
			request.notifyPacketSent(gatt.getDevice(), data);
			if (request.hasMore()) {
				enqueueFirst(mRequest);
			} else {
				mRequest.notifySuccess(gatt.getDevice());
			}
		} else if (status == BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION
				|| status == 137 /* GATT AUTH FAIL */) {
			log(Level.WARNING, "Authentication required (" + status + ")");
			if (gatt.getDevice().getBondState() != BluetoothDevice.BOND_NONE) {
				// This should never happen but it used to: http://stackoverflow.com/a/20093695/2115352
				Log.w(TAG, ERROR_AUTH_ERROR_WHILE_BONDED);
				mCallbacks.onError(gatt.getDevice(), ERROR_AUTH_ERROR_WHILE_BONDED, status);
			}
            // The request will be repeated when the bond state changes to BONDED.
            return;
		} else {
			Log.e(TAG, "onCharacteristicWrite error " + status);
			mRequest.notifyFail(gatt.getDevice(), status);
			mValueChangedRequest = null;
			onError(gatt.getDevice(), ERROR_WRITE_CHARACTERISTIC, status);
		}
		nextRequest(true);
	}