Seg Fault Error During Particle Template Insertion (Dynamic Fiber Insertion)

Hello,
I am adding code to the insert function of the particleToInsert class.
It is working for sparse insertions but hits a segmentation fault error once it starts to get dense.

I have started to block in segments of code and have narrowed down where it breaks. The issue is that it breaks between two fprintf statements...

I have a few questions that will hopefully narrow down where the issue is.
As spheres are added, via the create_atoms function, do all arrays also grow?
During particle insertion, do other function run as a different thread?

If it is helpful, I have made a commit on my github of the code that I am working on....
The commit (https://github.com/schrummy14/LIGGGHTS_Flexible_Fibers/commit/681e04c1fc...)

The file (https://github.com/schrummy14/LIGGGHTS_Flexible_Fibers/blob/master/src/p...)

I have also added an extra example in the bond package section under Single tests based on the shear cell. The max number of templates that can be inserted is 2143.

Any help is appreciated. Thank you.