diff --git a/packages/hydrooj/src/handler/judge.ts b/packages/hydrooj/src/handler/judge.ts
index d4b79c3fc..fdeb30f7e 100644
--- a/packages/hydrooj/src/handler/judge.ts
+++ b/packages/hydrooj/src/handler/judge.ts
@@ -75,7 +75,7 @@ export async function next(body: Partial<JudgeResultBody>) {
 }
 
 export async function postJudge(rdoc: RecordDoc) {
-    if (rdoc.contest.toString().startsWith('0'.repeat(23))) return;
+    if (rdoc.contest?.toString().startsWith('0'.repeat(23))) return;
     const accept = rdoc.status === builtin.STATUS.STATUS_ACCEPTED;
     const updated = await problem.updateStatus(rdoc.domainId, rdoc.pid, rdoc.uid, rdoc._id, rdoc.status, rdoc.score);
     if (rdoc.contest) {