diff --git a/packages/sonic/package.json b/packages/sonic/package.json
index 79a54da56..5765f648b 100644
--- a/packages/sonic/package.json
+++ b/packages/sonic/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@hydrooj/sonic",
-    "version": "1.2.0",
+    "version": "1.2.1",
     "description": "Sonic search service",
     "main": "service.js",
     "typings": "service.d.ts",
diff --git a/packages/sonic/script.ts b/packages/sonic/script.ts
index 44160e806..57e69bafd 100644
--- a/packages/sonic/script.ts
+++ b/packages/sonic/script.ts
@@ -13,7 +13,7 @@ export async function run({ domainId }, report) {
         if (!(i % 1000)) report({ message: `${i} problems indexed` });
         const union = await DomainModel.searchUnion({ union: pdoc.domainId, problem: true });
         const tasks = [];
-        for (const did of [domainId, ...union.map((j) => j._id)]) {
+        for (const did of [pdoc.domainId, ...union.map((j) => j._id)]) {
             tasks.push(
                 pdoc.title && sonic.push('problem', `${did}@title`, `${pdoc.domainId}/${pdoc.docId}`, pdoc.title),
                 pdoc.content.toString() && sonic.push('problem', `${did}@content`, `${pdoc.domainId}/${pdoc.docId}`, pdoc.content.toString()),