1 files changed, 3 insertions, 2 deletions
diff --git a/src/fields/ListField.ts b/src/fields/ListField.ts
index 925f8c7f4..e98ced902 100644
--- a/src/fields/ListField.ts
+++ b/src/fields/ListField.ts
@@ -1,6 +1,7 @@
 import { Field, FIELD_ID } from "./Field";
 import { BasicField } from "./BasicField";
 import { Types } from "../server/Message";
+import { ObjectId } from "bson";
 
 export class ListField<T extends Field> extends BasicField<T[]> {
     constructor(data: T[] = [], id: FIELD_ID = undefined) {
@@ -15,11 +16,11 @@ export class ListField<T extends Field> extends BasicField<T[]> {
         return new ListField<T>(this.Data);
     }
 
-    ToJson(): { type: Types, data: T[], id: string } {
+    ToJson(): { type: Types, data: T[], _id: ObjectId } {
         return {
             type: Types.List,
             data: this.Data,
-            id: this.Id as string
+            _id: new ObjectId(this.Id)
         }
     }
 }
 \ No newline at end of file