Thread: Program keeps crashing; attempting to extract each string (word) from text file

I am trying to write a program that will extract each string(word) from a text file and insert it into a linked list. The problem is my program keeps crashing and I cannot figure out why. I believe it is my insert method but I am not sure. Thanks!

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


struct node
{
  char *data;
  struct node *next;
};


void insertNode(struct node**, char *);
void printList(struct node*);


int main()
{
  struct node *head = NULL;
  FILE *fptr;
  char file_name[20];
  char str[1000];
  int numOfChar;


  printf("Enter the name of the file: ");
  scanf("%s",file_name);


  printf("Enter the number of characters per line: ");
  scanf("%d",&numOfChar);


  fptr=fopen(file_name,"r");


  while(fgets(str, sizeof str, fptr) != NULL)
  {
    int nitems = fscanf(fptr, "%999s", str);


    while (nitems == 1)
    {
        insertNode(&head, str);
        nitems = fscanf(fptr, "%999s", str);
    }


  }


  fclose(fptr);
  printList(head);


  return 0;
}


void insertNode(struct node** nodeHead, char *data)
{
    struct node* new_node = (struct node*) malloc(sizeof(struct node));
    struct node *last = *nodeHead;
    char *str;


    str= (char *)malloc(60*sizeof(char));
    strcpy(str, data);


    new_node->data  = str;
    new_node->next = NULL;


    if (*nodeHead == NULL)
    {
       *nodeHead = new_node;
       return;
    }


    while (last->next != NULL)
    {
        last = last->next;
    }


    last->next = new_node;
}


void printList(struct node* node)
{
    while(node != NULL)
    {
        printf(" %s ", node->data);
        node = node->next;
    }
}