runtime error: member access within null pointer of type ‘struct ListNode‘错误

LeetCode203错误分析:

(3条消息) LeetCode：runtime error: member access within null pointer of type 'struct ListNode'错误_时间有泪-CSDN博客

如上述博客方法进行更改后执行错误,最后的更改方式:

if(p==NULL){return head;
}
while(p->next!=NULL){if(p->next->val==val){q=p->next;p->next=q->next; delete q;}else{p=p->next;}
}

期望的改正方式:但改正后依旧如题目报错

while(p->next!=NULL&&p!=NULL){if(p->next->val==val){q=p->next;p->next=q->next; delete q;}else{p=p->next;}
}

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runtime error: member access within null pointer of type ‘struct ListNode‘错误

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