OMP accelaration reaxff

Dear all,
I’m trying to use the OMP package to speed up the reaxff calculation. At first, I got good results, and the calculation speed was more than doubled. I simulated the carburizing process of alloy and used “deposit” command to insert the gas molecules at NPT. I set 4000000 steps, but an error occurred in step 1497600 , APPLICATION TERMINATED WITH THE EXIT STRING: Aborted (signal 6).

Can you please guide me in solving the problem?
Thanks in advance

#################################lammps.e*########################################
*** Error in `/lammps-3Mar20/src/lmp_omp’: free(): invalid pointer: 0x0000000002ce6730 ***
##################################################################################

Please try a more recent version of LAMMPS.