错误0xC0000005: 读取位置 0x00000000 时发生访问冲突

#include <iostream>
using namespace std;
typedef struct fun
{
    char name[15];
    int num;
    float score;
    struct fun* next;
}node,*sqlist;
sqlist creat(sqlist &L)
{
    float x;
    sqlist p, q;
    L = new fun;
    p = L;
    cin >> x;
    while (x!=999)
    {
        q = new fun;
        q->score = x;
        cin >> q->name>>q->num;
        p->next = q;
        p = q;
        cin >> x;
    }
    return L;
}
void print(sqlist &L)
{
    sqlist q;
    q = new fun;
    q = L->next;
    while (q)
    {
        cout << '\t' << q->num << '\t' << q->name << '\t' << q->score << endl;
        q = q->next;
    }
    delete q;

}
int main()
{
    sqlist L=NULL;
    L=creat(L);
    print(L);
}

为什么一直会有一个指针的问题，老是会有错误出现，虽然简单的程序不影响结果，但是复杂一点就很烦

那个delete 是后来加的，即使不加delete也会有错误，有没有大神解答一下