To reproduce:
1) Open attached project
2) Build and run on iOS or Android
3) Tap "Go" and "Create Random"
4) After loading, tap a button in bottom right (Planet view)
5) Tap a button in bottom left (Go back to previous scene)
6) Repeat this a few times. Depending on device, the app crashes after 4-10 repeats
or
5) On the planet view double-tap any fleet in view
6) when in the "scanning" view, tap the top left back arrow
7) Repeat this a few times. Depending on device, the app crashes after 4-10 repeats

DUT:
Google Nexus 9 (Android 6.0.1)
HTC One M9 (Android 6.0)
Samsung Galaxy S6 edge (Android 5.1.1)
iPad Mini 2 (iOS 7.1) (Didn't crash with the first method)
iPad Air 2 (iOS 8.1) (Crashed with both methods)