diff --git a/chat/public/admin.js b/chat/public/admin.js
index 5499d9a..f2973f2 100644
--- a/chat/public/admin.js
+++ b/chat/public/admin.js
@@ -2313,7 +2313,7 @@
         requestsPerMinute: Number(el.limitRpm.value || 0),
         requestsPerHour: Number(el.limitRph.value || 0),
         requestsPerDay: Number(el.limitRpd.value || 0),
-        opencodeBackupModel: el.limitBackup.value.trim(),
+        opencodeBackupModel: el.limitBackup ? el.limitBackup.value.trim() : '',
       };
       setProviderLimitStatus('Saving...');
       try {