I'm not sure why it crashes but you don't need:
int * SpeedRun_Time = sys_malloc(sizeof(int));

simply using
int SpeedRun_Time = 0;
works.

remember, you only have to use pointers and allocate memory to them if you are initializing somthing
which has got a dynamic size (like dynamic array-sizes) or a non-fixed size (like BMAP* or STRING*) inside a function

an int is always 4 bytes big. -> fixed-size -> no need to allocate memory.

(But since I don't know that much about pointers/arrays/memory allocation, someone please correct me if I'm wrong)