[Not really OT] Crowdstrike Analysis: It was a NULL pointer from the memory unsafe C++ language.

[Walter Bright]

It's true that many algorithms depend on a null pointer being a "sentinel", and 
people sometimes forget to check for it. That means:

1. if they forgot to check for the null special case, then the seg fault tells 
them where the error is

2. if null was supposed not ever happen, then the seg fault tells where the error is

Dereferencing a null pointer is always a bug.