diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 7a7aa28b1..04c666977 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.29.26",
+    "version": "2.29.27",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/handler/manage.ts b/packages/hydrooj/src/handler/manage.ts
index f553d7663..eb0492b4c 100644
--- a/packages/hydrooj/src/handler/manage.ts
+++ b/packages/hydrooj/src/handler/manage.ts
@@ -191,35 +191,36 @@ class SystemUserImportHandler extends SystemHandler {
 
     @param('users', Types.Content)
     @param('draft', Types.Boolean)
-    async post(domainId: string, _users: string, draft: boolean) {
+    async post(domainId: string, _users: string, draft = true) {
         const users = _users.split('\n');
         const udocs = [];
-        const tasks = [];
         const messages = [];
         for (const i in users) {
             const u = users[i];
+            if (!u.trim()) continue;
             const [email, username, password, displayName] = u.split(',').map((t) => t.trim());
             if (email && username && password) {
-                if (!isEmail(email)) messages.push(`Line ${i + 1}: Invalid email.`);
-                else if (!isUname(username)) messages.push(`Line ${i + 1}: Invalid username`);
-                else if (!isPassword(password)) messages.push(`Line ${i + 1}: Invalid password`);
+                if (!isEmail(email)) messages.push(`Line ${+i + 1}: Invalid email.`);
+                else if (!isUname(username)) messages.push(`Line ${+i + 1}: Invalid username`);
+                else if (!isPassword(password)) messages.push(`Line ${+i + 1}: Invalid password`);
                 else {
                     udocs.push({
                         email, username, password, displayName,
                     });
-                    if (!draft) {
-                        tasks.push(
-                            (async () => {
-                                const uid = await user.create(email, username, password);
-                                if (displayName) await domain.setUserInDomain(domainId, uid, { displayName });
-                            })(),
-                        );
-                    }
                 }
-            } else messages.push(`Line ${i + 1}: Input invalid.`);
+            } else messages.push(`Line ${+i + 1}: Input invalid.`);
         }
         messages.push(`${udocs.length} users found.`);
-        await Promise.all(tasks);
+        if (!draft) {
+            for (const {
+                email, username, password, displayName,
+            } of udocs) {
+                // eslint-disable-next-line no-await-in-loop
+                const uid = await user.create(email, username, password);
+                // eslint-disable-next-line no-await-in-loop
+                if (displayName) await domain.setUserInDomain(domainId, uid, { displayName });
+            }
+        }
         this.response.body.path.push(['manage_user_import']);
         this.response.body.users = udocs;
         this.response.body.messages = messages;
diff --git a/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx b/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx
index 3977e7c83..eb7698d54 100644
--- a/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx
+++ b/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx
@@ -65,7 +65,7 @@ const mapDispatchToProps = (dispatch) => ({
     });
   },
   handleClickRefresh() {
-    this.loadSubmissions();
+    if (this.props.recordsVisible) this.loadSubmissions();
   },
 });
 
@@ -75,7 +75,7 @@ export default connect(mapStateToProps, mapDispatchToProps)(class ScratchpadTool
   };
 
   componentDidMount() {
-    this.props.loadSubmissions();
+    if (this.props.recordsVisible) this.props.loadSubmissions();
   }
 
   render() {
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 54d1c49bf..2d9a14ecd 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.12.23",
+  "version": "4.12.24",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
diff --git a/packages/ui-default/pages/manage_user_import.page.js b/packages/ui-default/pages/manage_user_import.page.js
index 7b1ce027a..b73492481 100644
--- a/packages/ui-default/pages/manage_user_import.page.js
+++ b/packages/ui-default/pages/manage_user_import.page.js
@@ -23,8 +23,8 @@ const page = new NamedPage('manage_user_import', () => {
     }
   }
 
-  $('[name="preview"]').click(() => post(true));
-  $('[name="submit"]').click(() => post(false));
+  $('[name="preview"]').on('click', () => post(true));
+  $('[name="submit"]').on('click', () => post(false));
 });
 
 export default page;