MapControl ( DeleteLayer ) PMF "compressed" or "compressed and locked" file

My application ( 10.1 ArcObject ) crash any time when I try to remove the PMF ( compressed format ) layer file loaded on the map.
I have a crash, when I delete it from the map ( myMapControl -> DeleteLayer(correctIndex) ), only if the PMF loaded on the map it is in the "compressed" or "compressed and locked" format. In all the other case work well.

Can somebody help my?

Thanks very much ....