diff --git a/subsys/bluetooth/controller/hci/hci.c b/subsys/bluetooth/controller/hci/hci.c
index 2196cac28c6..dce5f6a7a91 100644
--- a/subsys/bluetooth/controller/hci/hci.c
+++ b/subsys/bluetooth/controller/hci/hci.c
@@ -1206,6 +1206,7 @@ int hci_acl_handle(struct net_buf *buf)
 {
 	struct radio_pdu_node_tx *radio_pdu_node_tx;
 	struct bt_hci_acl_hdr *acl;
+	struct pdu_data *pdu_data;
 	u16_t handle;
 	u8_t flags;
 	u16_t len;
@@ -1230,20 +1231,24 @@ int hci_acl_handle(struct net_buf *buf)
 	handle = bt_acl_handle(handle);
 
 	radio_pdu_node_tx = radio_tx_mem_acquire();
-	if (radio_pdu_node_tx) {
-		struct pdu_data *pdu_data;
+	if (!radio_pdu_node_tx) {
+		BT_ERR("Tx Buffer Overflow");
+		return -ENOBUFS;
+	}
 
-		pdu_data = (struct pdu_data *)radio_pdu_node_tx->pdu_data;
-		if (flags == BT_ACL_START_NO_FLUSH || flags == BT_ACL_START) {
-			pdu_data->ll_id = PDU_DATA_LLID_DATA_START;
-		} else {
-			pdu_data->ll_id = PDU_DATA_LLID_DATA_CONTINUE;
-		}
-		pdu_data->len = len;
-		memcpy(&pdu_data->payload.lldata[0], buf->data, len);
-		if (radio_tx_mem_enqueue(handle, radio_pdu_node_tx)) {
-			radio_tx_mem_release(radio_pdu_node_tx);
-		}
+	pdu_data = (struct pdu_data *)radio_pdu_node_tx->pdu_data;
+	if (flags == BT_ACL_START_NO_FLUSH || flags == BT_ACL_START) {
+		pdu_data->ll_id = PDU_DATA_LLID_DATA_START;
+	} else {
+		pdu_data->ll_id = PDU_DATA_LLID_DATA_CONTINUE;
+	}
+	pdu_data->len = len;
+	memcpy(&pdu_data->payload.lldata[0], buf->data, len);
+
+	if (radio_tx_mem_enqueue(handle, radio_pdu_node_tx)) {
+		BT_ERR("Invalid Tx Enqueue");
+		radio_tx_mem_release(radio_pdu_node_tx);
+		return -EINVAL;
 	}
 
 	return 0;