diff --git a/drivers/usb/misc/adutux.c b/drivers/usb/misc/adutux.c
index 344d523..860eade 100644
--- a/drivers/usb/misc/adutux.c
+++ b/drivers/usb/misc/adutux.c
@@ -328,8 +328,10 @@ static int adu_release(struct inode *inode, struct file *file)
 	adu_release_internal(dev);
 	if (dev->udev == NULL) {
 		/* the device was unplugged before the file was released */
-		if (!dev->open_count)	/* ... and we're the last user */
+		if (dev && !dev->open_count) {	/* ... and we're the last user */
 			adu_delete(dev);
+			dev = NULL;
+		}
 	}
 unlock:
 	mutex_unlock(&adutux_mutex);
@@ -771,8 +773,10 @@ static void adu_disconnect(struct usb_interface *interface)
 	usb_set_intfdata(interface, NULL);
 
 	/* if the device is not opened, then we clean up right now */
-	if (!dev->open_count)
+	if (dev && !dev->open_count) {
 		adu_delete(dev);
+		dev = NULL;
+	}
 
 	mutex_unlock(&adutux_mutex);
 }