diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 0ec0fb4c3..f8643258b 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.11.14",
+    "version": "3.11.15",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",
diff --git a/packages/hydrooj/src/model/contest.ts b/packages/hydrooj/src/model/contest.ts
index 59078a906..deecc42c2 100644
--- a/packages/hydrooj/src/model/contest.ts
+++ b/packages/hydrooj/src/model/contest.ts
@@ -388,7 +388,7 @@ const homework = buildContestRule({
         for (const [rank, tsdoc] of rankedTsdocs) {
             const tsddict = {};
             for (const item of tsdoc.detail || []) {
-                if ((tsddict[item.pid].score || 0) <= item.score) tsddict[item.pid] = item;
+                if ((tsddict[item.pid]?.score || 0) <= item.score) tsddict[item.pid] = item;
             }
             const row: ScoreboardRow = [
                 { type: 'string', value: rank },