counting_bloom_add segfaults

counting.c

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

#include "dablooms.h"

int main() {
  counting_bloom_t* bloom = NULL;

  bloom = new_counting_bloom(1000, 0.05, "bloom.bin");

  if(bloom == NULL) {
    fprintf(stderr, "bloom init error\n");
    exit(EXIT_FAILURE);
  }

  const char* item = "test";


  // XXX
  counting_bloom_add(bloom, item, strlen(item));


  free_counting_bloom(bloom);

  return EXIT_SUCCESS;
}