Null Pointer Exception with Arduino Communication

Processing Electronics (Arduino, etc.)
15

I can’t look at it now, but here are 2 sscanf examples that get values from character arrays into integers.

sscanf(buffer, "%s %d %d %d", &z, &pc_count, &mouse_x, &mouse_y);
sscanf(&buff[star_ix + 4], "%d", &val);