Exception thrown error at runtime when writing to object

Question

I've been sitting here for hours trying to figure this out. I haven't been able to find a similar problem (although I'm sure it has been done). So on to my question. When I compile this, it is fine.
I should add that unsortedList is Book*, which is a struct.

string tit = tempBook->title;
string act = tempBook->action;
string aut = tempBook->author;
string sub = tempBook->subject;
char* tm = tempBook->time;

unsortedList[unsortedArrayLength].title;
unsortedList[unsortedArrayLength].action;
unsortedList[unsortedArrayLength].author;
unsortedList[unsortedArrayLength].subject;
unsortedList[unsortedArrayLength].time;  

However, when I compile this, I receive an error:
Exception thrown at 0x5AC6516F (vcruntime140d.dll) in Assign.exe: 0xC0000005: Access violation writing location 0x00000000.

string tit = tempBook->title;
string act = tempBook->action;
string aut = tempBook->author;
string sub = tempBook->subject;
char* tm = tempBook->time;

unsortedList[unsortedArrayLength].title = tit;
unsortedList[unsortedArrayLength].action = act;
unsortedList[unsortedArrayLength].author = aut;
unsortedList[unsortedArrayLength].subject = sub;
unsortedList[unsortedArrayLength].time = tm;  

And then it pops up window memcpy.asm with the cursor at this location:

CopyUpByteLoop:
    mov     al, byte ptr [esi]
    mov     byte ptr [edi], al
    inc     esi
    inc     edi
    dec     ecx
    jne     CopyUpByteLoop  

The definition of struct Book as requested:

    struct Book
{
    std::string title;
    std::string author;
    std::string subject;
    char* time;
    std::string action;
};

Here is the complete function:

    void DB::insertBook(Book* tempBook)
{
    using namespace std;
    unsortedArrayLength++;
    string tit = tempBook->title;
    string act = tempBook->action;
    string aut = tempBook->author;
    string sub = tempBook->subject;
    char* tm = tempBook->time;

    unsortedList[unsortedArrayLength].title = tit;
    unsortedList[unsortedArrayLength].action = act;
    unsortedList[unsortedArrayLength].author = aut;
    unsortedList[unsortedArrayLength].subject = sub;
    unsortedList[unsortedArrayLength].time = tm;

    system("cls");

    cout << "You have " << unsortedList[unsortedArrayLength].action <<":\n" << endl <<
    unsortedList[unsortedArrayLength].title << endl <<
    unsortedList[unsortedArrayLength].author << endl <<
    unsortedList[unsortedArrayLength].subject << endl <<
    "on " << unsortedList[unsortedArrayLength].time << endl << endl;

    printToLog(tempBook);
}

Please help Obi-Wan. You're my only hope...

Answer 1

Okay, I figured it out. I made the instantiation of the array bigger. It appeared I was hitting the upper bounds of the array. The array was initialized with 2, which I though would be enough, but however it was not. :( Thank you to all lent me their knowledge.