V4MD crash can delete data of db

[info at vallemediatime.com]

Hi Ruslan,
from two days sometimes I get a new problem:
if I stopped my movie after some commands I get a crash and the size of vdb
file become very little and the data are deleted.
(Btw, I save a copy of db in start session)

For the crash I understand that it's possible because I'm testing some new
methods for me, but why this can delete the 90% of data in vdb file?

I use this:

on stopMovie
gCursor = 0
Valentina.Shutdown()
Valentina = VOID
end

Thanks Paolo