Drivers Door Lock

On the key hole to unlock the driver's door there is a small door/flap that covers the key hole when the key is not present. Mine is missing or broke. Is it possible to repair/replace this without changing the tumbler?
Thank you in advance.

[J.HIDALGO]

It happened to me. After that, the alarm started to go off for no reason (may be humidity getting in the lock)...I ended up buying a new lock because they do not sell that flap by itself. It is expensive...