diff --git a/nimble/controller/src/ble_ll_scan.c b/nimble/controller/src/ble_ll_scan.c
index 7e19143dd..9e755cc3f 100644
--- a/nimble/controller/src/ble_ll_scan.c
+++ b/nimble/controller/src/ble_ll_scan.c
@@ -2635,11 +2635,13 @@ ble_ll_hci_send_ext_adv_report(uint8_t ptype, uint8_t *adva, uint8_t adva_type,
                 evt->evt_type |= (BLE_HCI_ADV_DATA_STATUS_INCOMPLETE);
             } else {
                 evt->evt_type |= (BLE_HCI_ADV_DATA_STATUS_TRUNCATED);
-                BLE_LL_AUX_SET_FLAG(aux_data, BLE_LL_AUX_TRUNCATED_SENT);
                 rc = -1;
-                if (!BLE_LL_AUX_CHECK_FLAG(aux_data, BLE_LL_SENT_EVENT_TO_HOST)) {
-                    ble_hci_trans_buf_free((uint8_t *)evt);
-                    goto done;
+                if (aux_data) {
+                    BLE_LL_AUX_SET_FLAG(aux_data, BLE_LL_AUX_TRUNCATED_SENT);
+                    if (!BLE_LL_AUX_CHECK_FLAG(aux_data, BLE_LL_SENT_EVENT_TO_HOST)) {
+                        ble_hci_trans_buf_free((uint8_t *)evt);
+                        goto done;
+                    }
                 }
 
             }