diff --git a/drivers/usb/serial/mxuport.c b/drivers/usb/serial/mxuport.c
index ab1d690274ae52b3230f04acbd8194a49f68b7ba..460a40669967855cfeea7c6cc911064822c6882a 100644
--- a/drivers/usb/serial/mxuport.c
+++ b/drivers/usb/serial/mxuport.c
@@ -1284,7 +1284,8 @@ static int mxuport_open(struct tty_struct *tty, struct usb_serial_port *port)
 	}
 
 	/* Initial port termios */
-	mxuport_set_termios(tty, port, NULL);
+	if (tty)
+		mxuport_set_termios(tty, port, NULL);
 
 	/*
 	 * TODO: use RQ_VENDOR_GET_MSR, once we know what it