diff --git a/apps/web/src/utils/judge.ts b/apps/web/src/utils/judge.ts
index 6015d21..614ad85 100644
--- a/apps/web/src/utils/judge.ts
+++ b/apps/web/src/utils/judge.ts
@@ -1,20 +1,27 @@
 import axios from "axios"
 import { decode, encode } from "./functions"
-import { Code } from "./types"
+import type { Code, LANGUAGE } from "./types"
 
 const http = axios.create({ baseURL: import.meta.env.PUBLIC_JUDGE0_URL })
 
+// Judge0 的语言 id。Flowchart 和 SQL 不在其中 —— 前者根本不是可执行代码，
+// 后者由本站自己的 SQL 沙箱判，都走不到 Judge0。
+const JUDGE0_LANGUAGE_ID: Partial<Record<LANGUAGE, number>> = {
+  C: 50,
+  "C++": 54,
+  Java: 62,
+  Golang: 60,
+  JavaScript: 63,
+  Python2: 70,
+  Python3: 71,
+}
+
 export async function createTestSubmission(code: Code, input: string) {
   const encodedCode = encode(code.value)
-  const id = {
-    C: 50,
-    "C++": 54,
-    Java: 62,
-    Golang: 60,
-    JavaScript: 63,
-    Python2: 70,
-    Python3: 71,
-  }[code.language]
+  const id = JUDGE0_LANGUAGE_ID[code.language]
+  if (id === undefined) {
+    return { status: null, output: `${code.language} 不支持在线试运行` }
+  }
   let compilerOptions = ""
   if (id === 50) compilerOptions = "-lm" // 解决 GCC 的链接问题
   const payload = {