Exception when accessing an array element

This is just weird. I'm trying to iterate through an array of structures, passed as a pointer like so:

void creeaza(Digraf* d,char* filename)

Where the type Digraf is defined through these structures:

typedef struct l{

int nr;

l* next;

}*LIST_AD;

typedef struct{

LIST_AD laI; //first element if internal list

LIST_AD laE; //first element of external list

LIST_AD lvf;

}HEAD;

typedef HEAD Digraf[1000];

Now when trying to do the following inside the above-mentioned creeaza function, the program crashes. Well to be more specific, the first printf statement works, all the addresses are displayed correctly. However, inside the for loop, when i becomes 2, the program crashes and throws an exception at the line directly under the for statement. Could anyone tell me what's going on Thanks in advance.

#ifdef DEBUG

printf("d[0], d[1], d[2], d[3]: %p %p %p %p\n",&d[0], &d[1], &d[2], &d[3]);

getc(stdin);

#endif

for(i = 0; i < n; i++){

d[ i ] -> laE = d[ i ] ->l aI = d[ i ] -> lvf = NULL;

[...] //some code ommitted

}

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