--- drivers/usb/serial/kobil_sct.c

+++ drivers/usb/serial/kobil_sct.c

@@ -372,7 +372,7 @@ static void kobil_read_int_callback(stru

}

tty = tty_port_tty_get(&port->port);

- if (urb->actual_length) {

+ if (tty && urb->actual_length) {

/* BEGIN DEBUG */

/*