I have been playing soldier for a lot and I have reached the 4th stage where you could buy the bison for 100 coins, but whenever I shoot the bison, it crashes the game instantly, I'm not sure whether it is a problem with the particle or the bison itself

Yup, it effects all versions, I fixed the bug in the newest build, but updating will clear some of your level times (a one-time thing for this update, I had to do some restructuring). Check out the discord channel for more details.