diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index a4028c94f..ac0c84afc 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -157,7 +157,14 @@ export class ProblemModel {
     ) {
         const ddoc = await DomainModel.get(domainId);
         const args: Partial<ProblemDoc> = {
-            title, tag, hidden: meta.hidden || false, nSubmit: 0, nAccept: 0, sort: sortable(pid || `P${docId}`, ddoc?.namespaces),
+            title,
+            tag,
+            hidden: meta.hidden || false,
+            nSubmit: 0,
+            nAccept: 0,
+            sort: sortable(pid || `P${docId}`, ddoc?.namespaces),
+            data: [],
+            additional_file: [],
         };
         if (pid) args.pid = pid;
         if (meta.difficulty) args.difficulty = meta.difficulty;
diff --git a/packages/hydrooj/src/model/storage.ts b/packages/hydrooj/src/model/storage.ts
index 4779584ce..a843fb788 100644
--- a/packages/hydrooj/src/model/storage.ts
+++ b/packages/hydrooj/src/model/storage.ts
@@ -142,6 +142,7 @@ export class StorageModel {
             { $set: { lastUsage: new Date() } },
             { returnDocument: 'after' },
         );
+        if (!value) throw new Error(`Original file ${src} not found`);
         const meta = {};
         await StorageModel.del([dst]);
         meta['Content-Type'] = mime(dst);