I am trying to generate 4096 bits key using the internal openPGP implementation (RFC-1991)

The process stops and the bat crash during the process.
The error is:

Access violation at address 00521878 in module "thebat.exe"
Read of address 00000000

The same problem happens also a few times when I generate 2048 bits key (but not all the times)
Any ideas?

I am using The bat 5.1.2 (unregistered copy)