Actor class crashes the editor on Play

Whenever I play a scene with this C++ class, the editor crashes. I have found no errors in my code, yet it still crashes with an “EXCEPTION_ACCESS_VIOLATION”. Could someone please explain why this is occurring? Here is the code:

#include "VoxelChunk.h"

AVoxelChunk::AVoxelChunk()
{
	PrimaryActorTick.bCanEverTick = true;
}

void AVoxelChunk::BeginPlay()
{
    Super::BeginPlay();

    for (auto x = 0; x < 15; x++)
    {
        for (auto y = 0; y < 15; y++)
        {
            for (auto z = 0; z < 15; z++)
            {
                chunk[x][y][z] = 1;
            }
        }
    }

    // Print contents of chunk array
    for (int i = 0; i < sizeof(chunk); i++)
    {
        GEngine->AddOnScreenDebugMessage(-1, 15.0f, 
            FColor::Yellow, FString::Printf(TEXT("%lld"), chunk[i]));
    }
}

Well, after creating a new project, it no longer crashes. I guess my visual studio project was corrupt.