diff --git a/src/services/new/collection/move-collections-list.ts b/src/services/new/collection/move-collections-list.ts
index 72f1e39c..ab53e59c 100644
--- a/src/services/new/collection/move-collections-list.ts
+++ b/src/services/new/collection/move-collections-list.ts
@@ -23,7 +23,7 @@ const validateArgs = makeSchemaValidator({
             items: {type: 'string'},
         },
         parentId: {
-            type: 'string',
+            type: ['string', 'null'],
         },
     },
 });
diff --git a/src/services/new/workbook/move-workbooks-list.ts b/src/services/new/workbook/move-workbooks-list.ts
index 9b9474b9..1e5c73b0 100644
--- a/src/services/new/workbook/move-workbooks-list.ts
+++ b/src/services/new/workbook/move-workbooks-list.ts
@@ -23,7 +23,7 @@ const validateArgs = makeSchemaValidator({
             items: {type: 'string'},
         },
         collectionId: {
-            type: 'string',
+            type: ['string', 'null'],
         },
     },
 });