diff --git a/sandbox/src/index.ts b/sandbox/src/index.ts
index 0327f42..a35d865 100644
--- a/sandbox/src/index.ts
+++ b/sandbox/src/index.ts
@@ -65,13 +65,18 @@ async function cloneAndRun(submissionData: SubmissionGetData) {
 	);
 	await git.checkout(submissionData.submission.commitHash);
 	const problemName = submissionData.submission.problem.pascalName;
-	const output = await runJava(
-		javaBinPath,
-		buildDir,
-		join(repoDir, problemName, problemName + '.java'),
-		problemName,
-		submissionData.submission.problem.realInput
-	);
+	let output: string;
+	try {
+		output = await runJava(
+			javaBinPath,
+			buildDir,
+			join(repoDir, problemName, problemName + '.java'),
+			problemName,
+			submissionData.submission.problem.realInput
+		);
+	} catch (error) {
+		output = `[An error occurred while running]\n${error}`;
+	}
 
 	const res = await fetch(urlJoin(adminUrl, 'api/submission'), {
 		method: 'POST',
@@ -128,7 +133,7 @@ async function loop() {
 async function run() {
 	while (true) {
 		await loop();
-		await new Promise((resolve) => setTimeout(resolve, 15000));
+		await new Promise((resolve) => setTimeout(resolve, 10000));
 	}
 }
 
diff --git a/sandbox/src/run/java.ts b/sandbox/src/run/java.ts
index c9ab573..b3399b3 100644
--- a/sandbox/src/run/java.ts
+++ b/sandbox/src/run/java.ts
@@ -1,8 +1,5 @@
-import fs from 'fs-extra';
 import { join } from 'path';
-import os from 'os';
 import { exec, spawn } from 'child_process';
-import { error } from 'console';
 import util from 'util';
 
 const execPromise = util.promisify(exec);