Segmentation fault during annealing in 2019.1, not in 2020.1

GROMACS version: 2019.1
GROMACS modification: No
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Segmentation fault during simulated annealing using the below mdp file when conducted with 2019.1 version but no problem in 2020.1. Thoughts?

nvt_SActest.mdp (1.9 KB)

What is seg faulting, grompp or mdrun? Is it reproducible with 2020.3?

That message arises during grompp, we do not have 2020.3 installed on our computer, so will try that soon