From c29dce23289e136d7df34be15a7617b0a1cb7307 Mon Sep 17 00:00:00 2001
From: cuixiaorui <cui_xiaorui@126.com>
Date: Sun, 23 Jun 2024 17:08:30 +0800
Subject: [PATCH] fix: Handle edge case when the statement is deleted

---
 apps/client/store/statement.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/apps/client/store/statement.ts b/apps/client/store/statement.ts
index cf4407367..b9e89c3b0 100644
--- a/apps/client/store/statement.ts
+++ b/apps/client/store/statement.ts
@@ -16,7 +16,14 @@ const statementIndex = ref(0);
 
 export function useStatement() {
   function setupStatement(course: Ref<Course | undefined>) {
-    statementIndex.value = course.value!.statementIndex || 0;
+    // 课程的 statement 会被删除，
+    // 如果记录的 statementIndex 所对应的 statement 被删除了
+    // 那么默认返回第一个 statement
+    if (course.value!.statementIndex >= course.value!.statements.length) {
+      statementIndex.value = 0;
+    } else {
+      statementIndex.value = course.value!.statementIndex || 0;
+    }
 
     const debouncedSaveProgress = debounce(() => {
       saveProgress();