Dear Ivan,
This crash is formally equivalent to the (first crash) reported in this thread, i.e. it comes from the pre-equilibrium de-excitation of a too heavy nucleus produced by a sub-125-MeV/n ion interaction.
The fix will be shipped out with FLUKA 4.0.2 later in the autumn. Let us know at fluka.teamATcern.ch if the crash occurrence prevents you from waiting until then.
Cheers,
Cesc