diff --git a/[refs] b/[refs]
index a08ba3b3132e..3aed949c0915 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 637d11bfb814637ec7b81e878db3ffea6408a89a
+refs/heads/master: 38237fd2be9421c104f84cc35665097bdce89013
diff --git a/trunk/drivers/usb/serial/usb_wwan.c b/trunk/drivers/usb/serial/usb_wwan.c
index b004b2a485c3..9c014e2ecd68 100644
--- a/trunk/drivers/usb/serial/usb_wwan.c
+++ b/trunk/drivers/usb/serial/usb_wwan.c
@@ -295,12 +295,15 @@ static void usb_wwan_indat_callback(struct urb *urb)
 		    __func__, status, endpoint);
 	} else {
 		tty = tty_port_tty_get(&port->port);
-		if (urb->actual_length) {
-			tty_insert_flip_string(tty, data, urb->actual_length);
-			tty_flip_buffer_push(tty);
-		} else
-			dbg("%s: empty read urb received", __func__);
-		tty_kref_put(tty);
+		if (tty) {
+			if (urb->actual_length) {
+				tty_insert_flip_string(tty, data,
+						urb->actual_length);
+				tty_flip_buffer_push(tty);
+			} else
+				dbg("%s: empty read urb received", __func__);
+			tty_kref_put(tty);
+		}
 
 		/* Resubmit urb so we continue receiving */
 		if (status != -ESHUTDOWN) {