diff --git a/framework/framework/validator.ts b/framework/framework/validator.ts
index ef64b2001..036665304 100644
--- a/framework/framework/validator.ts
+++ b/framework/framework/validator.ts
@@ -111,7 +111,7 @@ export const Types = {
     Float: [(v) => +v, (v) => Number.isFinite(+v)],
 
     ObjectId: [() => { throw new Error('mongodb package not found'); }, () => true],
-    Boolean: [(v) => !!(v && !['false', 'off'].includes(v)), null, true],
+    Boolean: [(v) => !!(v && !['false', 'off', 'no', '0'].includes(v)), null, true],
     Date: [
         (v) => {
             const d = v.split('-');
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index beca5b820..a88e3252c 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -192,23 +192,35 @@ export class ProblemMainHandler extends Handler {
     @param('target', Types.String)
     @param('hidden', Types.Boolean)
     async postCopy(domainId: string, pids: number[], target: string, hidden?: boolean) {
-        const t = `,${this.domain.share || ''},`;
-        if (t !== ',*,' && !t.includes(`,${target},`)) throw new PermissionError(target);
-        const ddoc = await domain.get(target);
+        let t = `,${this.domain.share || ''},`;
+        if (t !== ',*,' && !t.includes(`,${target},`)) throw new ProblemNotAllowCopyError(this.domain._id, target);
+        let ddoc = await domain.get(target);
         if (!ddoc) throw new NotFoundError(target);
         const dudoc = await user.getById(target, this.user._id);
         if (!dudoc.hasPerm(PERM.PERM_CREATE_PROBLEM)) throw new PermissionError(PERM.PERM_CREATE_PROBLEM);
         // Check if user can access all those problems
-        await problem.getList(
+        const pdict = await problem.getList(
             domainId, pids, this.user.hasPerm(PERM.PERM_VIEW_PROBLEM_HIDDEN) || this.user._id,
             true, ['docId'], true,
         );
         const ids = [];
         for (const pid of pids) {
+            let pdoc = pdict[pid];
+            if (pdoc.reference) {
+                // eslint-disable-next-line no-await-in-loop
+                [pdoc, ddoc] = await Promise.all([
+                    problem.get(pdoc.reference.domainId, pdoc.reference.pid),
+                    domain.get(pdoc.reference.domainId),
+                ]);
+                if (!pdoc) throw new ProblemNotFoundError(pdoc.reference.domainId, pdoc.reference.pid);
+                t = `,${ddoc.share || ''},`;
+                if (t !== ',*,' && !t.includes(`,${target},`)) throw new ProblemNotAllowCopyError(ddoc._id, target);
+            }
             // eslint-disable-next-line no-await-in-loop
-            ids.push(await problem.copy(domainId, pid, target, undefined, hidden));
+            ids.push(await problem.copy(pdoc.domainId, pdoc.docId, target, undefined, hidden));
         }
         this.response.body = ids;
+        if (ids.length === 1) this.response.redirect = this.url('problem_detail', { domainId: target, pid: ids[0] });
     }
 
     @param('pids', Types.NumericArray)
@@ -420,28 +432,6 @@ export class ProblemDetailHandler extends ContestDetailBaseHandler {
         this.back();
     }
 
-    @param('target', Types.String)
-    async postCopy({ }, target: string) {
-        let t = `,${this.domain.share || ''},`;
-        if (t !== ',*,' && !t.includes(`,${target},`)) throw new ProblemNotAllowCopyError(this.domain._id, target);
-        let ddoc = await domain.get(target);
-        if (!ddoc) throw new NotFoundError(target);
-        const dudoc = await user.getById(target, this.user._id);
-        let pdoc = this.pdoc;
-        if (this.pdoc.reference) {
-            [pdoc, ddoc] = await Promise.all([
-                problem.get(this.pdoc.reference.domainId, this.pdoc.reference.pid),
-                domain.get(this.pdoc.reference.domainId),
-            ]);
-            if (!pdoc) throw new ProblemNotFoundError(this.pdoc.reference.domainId, this.pdoc.reference.pid);
-            t = `,${ddoc.share || ''},`;
-            if (t !== ',*,' && !t.includes(`,${target},`)) throw new ProblemNotAllowCopyError(ddoc._id, target);
-        }
-        if (!dudoc.hasPerm(PERM.PERM_CREATE_PROBLEM)) throw new PermissionError(PERM.PERM_CREATE_PROBLEM);
-        const docId = await problem.copy(pdoc.domainId, pdoc.docId, target);
-        this.response.redirect = this.url('problem_detail', { domainId: target, pid: docId });
-    }
-
     async postDelete() {
         if (!this.user.own(this.pdoc, PERM.PERM_EDIT_PROBLEM_SELF)) this.checkPerm(PERM.PERM_EDIT_PROBLEM);
         const tdocs = await contest.getRelated(this.args.domainId, this.pdoc.docId);
diff --git a/packages/hydrooj/src/model/message.ts b/packages/hydrooj/src/model/message.ts
index f43a14d53..6fdf332bf 100644
--- a/packages/hydrooj/src/model/message.ts
+++ b/packages/hydrooj/src/model/message.ts
@@ -31,9 +31,8 @@ class MessageModel {
     }
 
     static async sendInfo(to: number, content: string) {
-        const _id = new ObjectId();
         const mdoc: MessageDoc = {
-            _id, from: 1, to, content, flag: MessageModel.FLAG_INFO | MessageModel.FLAG_I18N,
+            from: 1, to, content, flag: MessageModel.FLAG_INFO | MessageModel.FLAG_I18N,
         };
         bus.broadcast('user/message', [to], mdoc);
     }
diff --git a/packages/hydrooj/src/plugin-api.ts b/packages/hydrooj/src/plugin-api.ts
index 58cebb39d..e70bbf508 100644
--- a/packages/hydrooj/src/plugin-api.ts
+++ b/packages/hydrooj/src/plugin-api.ts
@@ -6,7 +6,7 @@ export { default as moment, isMoment } from 'moment-timezone';
 
 export {
     WebService, Router, HandlerCommon, httpServer,
-    Query, Mutation, Subscription, Apis,
+    Query, Mutation, Subscription, Apis, APIS,
 } from '@hydrooj/framework';
 
 export * from './pipelineUtils';
diff --git a/packages/ui-default/components/dialog/index.tsx b/packages/ui-default/components/dialog/index.tsx
index c9761963f..5f2b898e8 100644
--- a/packages/ui-default/components/dialog/index.tsx
+++ b/packages/ui-default/components/dialog/index.tsx
@@ -1,6 +1,7 @@
 /* eslint-disable react-refresh/only-export-components */
 import $ from 'jquery';
 import React from 'react';
+import ReactDOM from 'react-dom/client';
 import { i18n, tpl } from 'vj/utils';
 import DomainSelectAutoComplete from '../autocomplete/components/DomainSelectAutoComplete';
 import UserSelectAutoComplete from '../autocomplete/components/UserSelectAutoComplete';
@@ -125,6 +126,8 @@ export async function prompt<T extends string>(title: string, fields: Record<T,
   const defaultValues = Object.fromEntries(Object.entries(fields)
     .map(([name, field]: [T, Field]) => [name, field.default || ''])) as Record<T, string | number | boolean>;
 
+  console.log(valueCache, defaultValues);
+
   const Component = () => {
     const [values, setValues] = React.useState(defaultValues);
 
@@ -132,7 +135,7 @@ export async function prompt<T extends string>(title: string, fields: Record<T,
       valueCache = values;
     }, [values]);
 
-    return <div style={{ display: 'none' }}>
+    return <div>
       <div className="row"><div className="columns">
         <h1>{title}</h1>
       </div></div>
@@ -169,8 +172,12 @@ export async function prompt<T extends string>(title: string, fields: Record<T,
       </div>)}
     </div>;
   };
+  const div = document.createElement('div');
+  const root = ReactDOM.createRoot(div);
+  root.render(<Component />);
   const res = await new Dialog({
-    $body: $(tpl(<Component />, true)),
+    $body: $(div),
+    $action: [buttonCancel, buttonOk].join('\n'),
     onDispatch(action) {
       if (action === 'ok') {
         for (const [name, field] of Object.entries(fields)) {
@@ -180,6 +187,7 @@ export async function prompt<T extends string>(title: string, fields: Record<T,
       return true;
     },
   }).open();
+  root.unmount();
   if (res !== 'ok') return null;
   return valueCache;
 }