src/pages/create/index.tsx

@@ -1045,6 +1045,11 @@ export const CreatePage = () => {
     // Seems like it's npub format
     if (value.trim().startsWith('npub1')) {
       setPastedUserNpubOrNip05(value.trim())
+    } else if (value.trim().startsWith('nsec1')) {
+      toast.warn('Oops - never paste your nsec into a website! Key deleted.')
+      if (searchFieldRef.current) searchFieldRef.current.value = ''
+      setUserSearchInput('')
+      return
     } else {
       // Disarm the add user on enter hit, and trigger search after 1 second
       disarmAddOnEnter()