Depends.. yes, why was the flight plan not rejected individually or before (and where is at least the proper logging which allows to find the root cause and restart quicker)? But the system is likely more complex and distributed, and I can also see that defensively programmed safety critical systems can and should do that at a certain point where certain input or output is just unexpected and wrong. To recover in some way or silently go on with eventually unexpected (even if not undefined) behaviour then is no option.