What archX are you using for your OS? 32 or 64 bit? I'm using Debian 64 on ARM64, and I think I'm running into a depreciation in regards to the "sizeof()" or "strlen()" functions to correctly allocate buffer space for the yolo object arguments. It looks like the original code was bound to a 32 bit environment.
The kicker is that this is my SECOND time going through this journey... accidentally deleted my live and backup images.. "DOH!"
This fellow was helpful... Segmentation fault (core dumped) when using YOLOv3 from pjreddie