Steps to reproduce:
1) Open the attached project.
2) Deploy to a device via Xcode.
3) Launch the app.
4) Enter the helicopter minigame (will ask to enter your username).
5) Collect coins.

After collecting some coins, the game will crash. It crashes at the point where particle system effect of a coin being collected is about to end. The app crashes with EXC_BAD_ACCESS error.

Reproduced on:
5.5.0a2, 5.4.0b24, 5.4.0b22

Did not reproduce:
5.4.0b21, 5.3.5p6, 5.2.4f1