Corrupted savegame makes my game crash on Android

Development Pipeline & Plugins Editor Scripting
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1

Hello !

I’m using the save system for my game. In my save game class I store collectible IDs. The save is loaded from the gamemode’s BeginPlay method.

bool UMyGameInstance::LoadGameFromSlot(int SlotID, bool forceLoad)
{
	if (!forceLoad && m_CurrentSaveGame != nullptr)
	{
		UE_LOG(LogTemp, Error, TEXT("LoadGameFromSlot: Attempt to load a game when another game is already loaded !"));
		return false;
	}

	FString name;
	if (GetSlotNameForSlotId(SlotID, name))
	{
		m_CurrentSaveSlotId = SlotID;
		m_CurrentGameSaveSlotName = name;
		if (UGameplayStatics::DoesSaveGameExist(name, 0))
			m_CurrentSaveGame = Cast<UMySaveGame>(UGameplayStatics::LoadGameFromSlot(name, 0));
		else
			m_CurrentSaveGame = Cast<UMySaveGame>(UGameplayStatics::CreateSaveGameObject(UMySaveGame::StaticClass()));

		m_CurrentSaveSlots->LastPlayedSlotId = m_CurrentSaveSlotId;
		SaveSlots();

		return true;
	}
	return false;
}

Here is my SaveGame class:

UCLASS()
class MYGAME_API UMySaveGame : public USaveGame
{
	GENERATED_BODY()

public:

	UMySaveGame();

	virtual void BeginDestroy() override;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Basic)
	TArray<int32> collectibles;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Basic)
	int LastVisitedMapId = 0;

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Basic)
	int LastUnlockedMapId = 0;
};

I have then 2 different crashs that only occur on Android (never in editor).

  • One from the a level where I list all collected collectibles. It crashes everytime the level starts.
  • One when I break the object (In game) containing a collectible. This crash is really random. It works correcly most of the time.

For both cases it crashes at the exact same place, in a blueprint method where I get the CurrentGameSave and check it with a “IsValid” call. It crashes during the IsValid call! Here is the callstack I get from adb:

Script Stack:
BP_CollectibleActor_C.CheckActivation
BP_CollectibleActor_C.ActivateCollectible
BP_BreakableActor_C.ExecuteUbergraph_BP_BreakableActor
BP_BreakableActor_C.ReceiveHit

[2017.10.03-15.24.47:579][
0]LogOutputDevice:Warning:

Script Stack:
BP_CollectibleActor_C.CheckActivation
BP_CollectibleActor_C.ActivateCollectible
BP_BreakableActor_C.ExecuteUbergraph_BP_BreakableActor
BP_BreakableActor_C.ReceiveHit

Assertion failed: Index >= 0 [File:Runtime/CoreUObject/Public\UObject/UObjectArray.h] [Line: 455]

libUE4.so!FDebug::LogAssertFailedMessage(char const*, char const*, int, wchar_t const*, …)

libUE4.so!UKismetSystemLibrary::execIsValid(FFrame&,
void)*
libUE4.so!UFunction::Invoke(UObject*,
FFrame&, void*)
libUE4.so!UObject::CallFunction(FFrame&,
void*, UFunction*)
libUE4.so!UObject::ProcessContextOpcode(FFrame&,
void*, bool)
libUE4.so!UObject::execLetBool(FFrame&,
void*)
libUE4.so!UObject::ProcessInternal(FFrame&, void*)
libUE4.so!UObject::CallFunction(FFrame&,
void*, UFunction*)
libUE4.so!UObject::ProcessInternal(FFrame&, void*)
libUE4.so!UObject::CallFunction(FFrame&,
void*, UFunction*)
libUE4.so!UObject::ProcessContextOpcode(FFrame&,
void*, bool)
libUE4.so!UObject::ProcessInternal(FFrame&, void*)
libUE4.so!UObject::CallFunction(FFrame&,
void*, UFunction*)
libUE4.so!UObject::ProcessInternal(FFrame&, void*)
libUE4.so!UFunction::Invoke(UObject*,
FFrame&, void*)
libUE4.so!UObject::ProcessEvent(UFunction*, void*)
libUE4.so!AActor::ReceiveHit(UPrimitiveComponent*,
AActor*, UPrimitiveComponent*, bool,
FVector, FVector, FVector, FHitResult
const&)

I really don’t understand why it crashes, if you need more info, let me know !