diff --git a/src/views/ballotpage/BallotPage.vue b/src/views/ballotpage/BallotPage.vue
index 79a6042..fc6c5d6 100644
--- a/src/views/ballotpage/BallotPage.vue
+++ b/src/views/ballotpage/BallotPage.vue
@@ -218,21 +218,23 @@ let hour = ref(0);
 let minute = ref(0);
 let seconds = ref(0);
 let timer = setInterval(() => {
-  let endTime = parseInt(new Date(data.value.voteEndTime).getTime() / 1000);
-  let nowTime = parseInt(new Date().getTime() / 1000);
-  if (endTime > nowTime) {
-    hour.value = parseInt(
-      dayjs(data.value.voteEndTime).diff(dayjs(), "minute") / 60
-    );
-    minute.value = parseInt(
-      dayjs(data.value.voteEndTime).diff(dayjs(), "minute") % 60
-    );
-    seconds.value = parseInt(
-      dayjs(data.value.voteEndTime).diff(dayjs(), "seconds") -
-        (hour.value * 60 + minute.value) * 60
-    );
-  } else {
-    clearInterval(timer);
+  if (data && data.value && data.value.voteEndTime) {
+    let endTime = parseInt(new Date(data.value.voteEndTime).getTime() / 1000);
+    let nowTime = parseInt(new Date().getTime() / 1000);
+    if (endTime > nowTime) {
+      hour.value = parseInt(
+        dayjs(data.value.voteEndTime).diff(dayjs(), "minute") / 60
+      );
+      minute.value = parseInt(
+        dayjs(data.value.voteEndTime).diff(dayjs(), "minute") % 60
+      );
+      seconds.value = parseInt(
+        dayjs(data.value.voteEndTime).diff(dayjs(), "seconds") -
+          (hour.value * 60 + minute.value) * 60
+      );
+    } else {
+      clearInterval(timer);
+    }
   }
 }, 1000);
 
diff --git a/src/views/homeworkpage/HomeworkPage.vue b/src/views/homeworkpage/HomeworkPage.vue
index f0f2b7a..30c4e38 100644
--- a/src/views/homeworkpage/HomeworkPage.vue
+++ b/src/views/homeworkpage/HomeworkPage.vue
@@ -175,8 +175,8 @@ const state = reactive({
 const { hour, minute, seconds } = toRefs(state);
 
 let timer = setInterval(() => {
-  console.log("endTime", data.value.submitEndTime);
-  if (data && data.value.submitEndTime) {
+  // console.log("endTime", data.value.submitEndTime);
+  if (data && data.value && data.value.submitEndTime) {
     let endTime = parseInt(new Date(data.value.submitEndTime).getTime() / 1000);
     let nowTime = parseInt(new Date().getTime() / 1000);
     console.log("endTime222", endTime, nowTime);