diff --git a/packages/hydrojudge/package.json b/packages/hydrojudge/package.json
index 0ae84b500..12a9cbcd8 100644
--- a/packages/hydrojudge/package.json
+++ b/packages/hydrojudge/package.json
@@ -1,12 +1,12 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.5.17",
+    "version": "2.5.18",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",
     "dependencies": {
-        "@hydrooj/utils": "^1.0.8",
+        "@hydrooj/utils": "^1.0.9",
         "adm-zip": "^0.5.5",
         "axios": "^0.21.1",
         "bson": "^4.3.0",
diff --git a/packages/hydrojudge/src/cases.ts b/packages/hydrojudge/src/cases.ts
index 3467b2479..276760932 100644
--- a/packages/hydrojudge/src/cases.ts
+++ b/packages/hydrojudge/src/cases.ts
@@ -104,8 +104,9 @@ async function read0(folder: string, files: string[], checkFile, cfg) {
     return config;
 }
 
-async function read1(folder: string, files: string[], checkFile, cfg) {
+async function read1(folder: string, files: string[], checkFile, cfg, rst) {
     const subtask = {};
+    for (const s of rst.subtasks) if (s.id) subtask[s.id] = s;
     const subtasks = [];
     for (const file of files) {
         for (const REG of RE1) {
@@ -150,7 +151,7 @@ async function read1(folder: string, files: string[], checkFile, cfg) {
     return config;
 }
 
-async function readAutoCases(folder, { next }, cfg) {
+async function readAutoCases(folder, { next }, cfg, rst) {
     const config = {
         checker_type: 'default',
         count: 0,
@@ -170,7 +171,7 @@ async function readAutoCases(folder, { next }, cfg) {
             files.push(...outputs.map((i) => `output/${i}`));
         }
         let result = await read0(folder, files, checkFile, cfg);
-        if (!result.count) result = await read1(folder, files, checkFile, cfg);
+        if (!result.count) result = await read1(folder, files, checkFile, cfg, rst);
         Object.assign(config, result);
         next({ message: { message: 'Found {0} testcases.', params: [config.count] } });
     } catch (e) {
@@ -214,8 +215,12 @@ export default async function readCases(folder: string, cfg: Record<string, any>
     } catch (e) {
         throw changeErrorType(e, FormatError);
     }
-    if (!(result.outputs?.length || result.subtasks.length)) {
-        const c = await readAutoCases(folder, args, config);
+    let auto = !result.outputs?.length;
+    if (!result.subtasks.length) {
+        auto = !Math.sum(result.subtasks.map((subtask) => subtask.cases.length));
+    }
+    if (auto) {
+        const c = await readAutoCases(folder, args, config, result);
         result.subtasks = c.subtasks;
         result.count = c.count;
     }
diff --git a/packages/utils/lib/cases.ts b/packages/utils/lib/cases.ts
index bd5845c1b..71c1607bd 100644
--- a/packages/utils/lib/cases.ts
+++ b/packages/utils/lib/cases.ts
@@ -51,7 +51,7 @@ export default async function readYamlCases(cfg: Record<string, any> = {}, check
     } else if (cfg.subtasks) {
         for (const subtask of cfg.subtasks) {
             const cases = [];
-            for (const c of subtask.cases) {
+            for (const c of subtask.cases || []) {
                 config.count++;
                 cases.push({
                     input: c.input ? checkFile(c.input, 'Cannot find input file {0}.') : '/dev/null',
diff --git a/packages/utils/package.json b/packages/utils/package.json
index 0968a23b8..0e596ce8f 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@hydrooj/utils",
-    "version": "1.0.8",
+    "version": "1.0.9",
     "description": "hydrooj utils",
     "main": "package.json",
     "repository": "https://github.com/hydro-dev/Hydro.git",