--- 485fa9c5b10766698caabf03c580f92715c86bba
+++ a861cd2cb9318fd4692413686eb6117b50b7b588
@@ -714,7 +714,6 @@ static void mos7840_bulk_in_callback(str
 	mos7840_port = urb->context;
 	if (!mos7840_port) {
 		dbg("%s", "NULL mos7840_port pointer");
-		mos7840_port->read_urb_busy = false;
 		return;
 	}