From ba31161609d4131a5d039046435a8f21805e301d Mon Sep 17 00:00:00 2001
From: JaneyLin <105125897+janeyziqinglin@users.noreply.github.com>
Date: Wed, 8 Jun 2022 17:47:49 -0500
Subject: [PATCH] =?UTF-8?q?Update=20=E9=9D=A2=E8=AF=95=E9=A2=9802.07.?=
 =?UTF-8?q?=E9=93=BE=E8=A1=A8=E7=9B=B8=E4=BA=A4.md?=
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---
 problems/面试题02.07.链表相交.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/problems/面试题02.07.链表相交.md b/problems/面试题02.07.链表相交.md
index 0a38cc33..ba6631a4 100644
--- a/problems/面试题02.07.链表相交.md
+++ b/problems/面试题02.07.链表相交.md
@@ -160,6 +160,8 @@ class Solution:
         那么，只要其中一个链表走完了，就去走另一条链表的路。如果有交点，他们最终一定会在同一个
         位置相遇
         """
+        if headA is None or headB is None: 
+            return None
         cur_a, cur_b = headA, headB     # 用两个指针代替a和b