diff --git a/packages/hydrojudge/package.json b/packages/hydrojudge/package.json
index 179e68d47..d702e59ce 100644
--- a/packages/hydrojudge/package.json
+++ b/packages/hydrojudge/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.8.16",
+    "version": "2.8.17",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",
diff --git a/packages/hydrojudge/src/judge/submit_answer.ts b/packages/hydrojudge/src/judge/submit_answer.ts
index b3114a019..7162c6b17 100644
--- a/packages/hydrojudge/src/judge/submit_answer.ts
+++ b/packages/hydrojudge/src/judge/submit_answer.ts
@@ -10,6 +10,7 @@ export async function judge({
     let totalStatus = 0;
     for (const i in config.outputs) {
         const c = config.outputs[i];
+        outputs[i] = outputs[i] || '';
         let status = STATUS.STATUS_WRONG_ANSWER;
         let score = 0;
         if (outputs[i].trim() === (c.output || c[0]).trim()) {