From bc349bcc684954ce110f6a4a82c14a8f2ad01853 Mon Sep 17 00:00:00 2001
From: alec_dev <acwhite211@gmail.com>
Date: Mon, 9 Mar 2026 14:41:10 -0500
Subject: [PATCH] Handle undefined field for isToOne

---
 .../js_src/lib/components/FormSliders/RecordSelector.tsx      | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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(
     () =>