recommender system works

1 files changed, 3 insertions, 2 deletions

diff --git a/src/new_fields/ObjectField.ts b/src/new_fields/ObjectField.ts
index 65ada91c0..566104b40 100644
--- a/src/new_fields/ObjectField.ts
+++ b/src/new_fields/ObjectField.ts
@@ -1,6 +1,6 @@
 import { Doc } from "./Doc";
 import { RefField } from "./RefField";
-import { OnUpdate, Parent, Copy, ToScriptString } from "./FieldSymbols";
+import { OnUpdate, Parent, Copy, ToScriptString, ToString } from "./FieldSymbols";
 import { Scripting } from "../client/util/Scripting";
 
 export abstract class ObjectField {
@@ -9,11 +9,12 @@ export abstract class ObjectField {
     abstract [Copy](): ObjectField;
 
     abstract [ToScriptString](): string;
+    abstract [ToString](): string;
 }
 
 export namespace ObjectField {
     export function MakeCopy<T extends ObjectField>(field: T) {
-        return field[Copy]();
+        return field?.[Copy]();
     }
 }