What does Unison OS do with deferenced null pointers, index out of bounds access (not writing), and usage of unintialized variables?

I'm trying to determine if a particular given C language source code run on [Unison OS](https://rowebots.com/unison-rtos/) that I have could conceivably lead to a crash, and through what vectors. There are sections of the code that will on occasion attempt to dereference null pointers, access, but not write to, array indices out of bounds, and use possibly uninitialized variables. The behavior is undefined and thus unpredictable in C, but according to other discussions I've read, the operating system and/or CPU will have a default behavior in these kinds of situations. I don't own the code in question and I'm not trying to fix it. I just want to understand on a high level if there's a reasonable possibility of any of these (and which) leading to the program crashing.