diff --git a/packages/hydrooj/src/model/contest.ts b/packages/hydrooj/src/model/contest.ts
index 9c5efc170..d9a5bd699 100644
--- a/packages/hydrooj/src/model/contest.ts
+++ b/packages/hydrooj/src/model/contest.ts
@@ -557,13 +557,13 @@ export function isNotStarted(tdoc: Tdoc) {
 
 export function isOngoing(tdoc: Tdoc, tsdoc?: any) {
     const now = new Date();
-    if (tsdoc && tsdoc?.startAt <= new Date(Date.now() - Math.floor(tdoc.duration * Time.hour))) return false;
+    if (tsdoc && tsdoc.startAt <= new Date(Date.now() - Math.floor(tdoc.duration * Time.hour))) return false;
     return (tdoc.beginAt <= now && now < tdoc.endAt);
 }
 
 export function isDone(tdoc: Tdoc, tsdoc?: any) {
     if (tdoc.endAt <= new Date()) return true;
-    if (tsdoc && tsdoc?.startAt <= new Date(Date.now() - Math.floor(tdoc.duration * Time.hour))) return true;
+    if (tsdoc && tsdoc.startAt <= new Date(Date.now() - Math.floor(tdoc.duration * Time.hour))) return true;
     return false;
 }
 
diff --git a/type-challenges b/type-challenges
deleted file mode 160000
index 38f0264f7..000000000
--- a/type-challenges
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 38f0264f7da6b57f1915b1583239b090e91e1470