diff --git a/specifyweb/frontend/js_src/lib/components/FormSliders/RecordSelector.tsx b/specifyweb/frontend/js_src/lib/components/FormSliders/RecordSelector.tsx
index e7b025c91fd..8c203cfc15e 100644
--- a/specifyweb/frontend/js_src/lib/components/FormSliders/RecordSelector.tsx
+++ b/specifyweb/frontend/js_src/lib/components/FormSliders/RecordSelector.tsx
@@ -84,7 +84,9 @@ export function useRecordSelector<SCHEMA extends AnySchema>({
     [index]
   );
 
-  const isToOne = !relationshipIsToMany(field) || shouldBeToOne(field);
+  const isToOne = field === undefined 
+    ? false
+    : !relationshipIsToMany(field) || shouldBeToOne(field);
 
   const handleResourcesSelected = React.useMemo(
     () =>