1 files changed, 4 insertions, 1 deletions
diff --git a/src/fields/CursorField.ts b/src/fields/CursorField.ts
index 84917ae53..870dfbeac 100644
--- a/src/fields/CursorField.ts
+++ b/src/fields/CursorField.ts
@@ -1,6 +1,6 @@
 import { createSimpleSchema, object, serializable } from 'serializr';
 import { Deserializable } from '../client/util/SerializationHelper';
-import { Copy, FieldChanged, ToScriptString, ToString } from './FieldSymbols';
+import { Copy, FieldChanged, ToJavascriptString, ToScriptString, ToString } from './FieldSymbols';
 import { ObjectField } from './ObjectField';
 
 export type CursorPosition = {
@@ -55,6 +55,9 @@ export default class CursorField extends ObjectField {
         return new CursorField(this.data);
     }
 
+    [ToJavascriptString]() {
+        return 'invalid';
+    }
     [ToScriptString]() {
         return 'invalid';
     }