I'm guessing that this is because you have a relatively small number of jobs set up in your job policy. For example, if you have 1 job set up, and 100 points in your monte carlo, it will tell spectre to do a 100 point monte carlo analysis. If you had 2 jobs and 100 points, then you'd get two jobs, each with 50 points (this is assuming a single test and a single corner). Anyway, since spectre is doing the monte carlo analysis, if there's a fatal error, the simulator will exit - and the remaining monte carlo points in that invocation of the simulator will be aborted.
You could run more jobs - but then they'll run in parallel.
However, the key thing is probably getting the fatal error addressed - this shouldn't happen. Either it's due to something in the setup, or it's a bug in the simulator. I'd guess that it's likely to fail on subsequent points too, depending on the reason for the fatal error.