Curses bug panel

// Problem solved (line 51)

#include <stdio.h>
#include <stdlib.h>
#include <panel.h>
#include <unistd.h>

struct list
{
    struct list *next;
    WINDOW *window;
    PANEL *panel;
};

static struct list *the_list;

void add();
void del();
int count();

int main()
{
    initscr();
    the_list = malloc(sizeof(struct list));
    the_list->next = NULL;
    while(1)
    {
    for(int i = 0; i < 100; i++)
    {
        //usleep(20000); // Debug (to slow the output)
        add();
        printf("%d\n", count()); // Debug
        refresh();
    }
    for(int i = 0; i < 100; i++)
    {
        //usleep(20000);
        del();
        printf("%d\n", count());
        refresh();
    }
    }
    free(the_list);
    return 0;
}

void del()
{
    struct list **list = &the_list;
    struct list *temp = the_list;
    delwin((*list)->window); //this one must not occur before
    del_panel((*list)->panel); // this one.
    *list = (*list)->next;
    free(temp);
}

void add()
{
    struct list **list = &the_list;
    while((*list)->next != NULL)
        list = &(*list)->next;
    (*list)->next = malloc(sizeof(struct list));
    (*list)->next->next = NULL;
    (*list)->window = newwin(0,0,0,0);
    (*list)->panel = new_panel((*list)->window);
}

// Just for debug
int count()
{
    int nb = 0;
    struct list **list = &the_list;
    while((*list)->next != NULL)
    {
        list = &(*list)->next;
        nb++;
    }
    return nb;
}