port = (struct usb_serial_port *) urb->context;
tty = port->tty;
- if (urb->actual_length) {
+ if (tty && urb->actual_length) {
/* 0x80 bit is error flag */
if ((data[0] & 0x80) == 0) {
/* no errors on individual bytes, only possible overrun err*/
port = (struct usb_serial_port *) urb->context;
tty = port->tty;
- if (urb->actual_length) {
+ if (tty && urb->actual_length) {
/* 0x80 bit is error flag */
if ((data[0] & 0x80) == 0) {
/* no error on any byte */