fix: defaults

frontend/src/app/recollections/logos/LogosPage.tsx

@@ -109,13 +109,13 @@ export function LogosPage() {
     [recollectionId]
   )
 
-  const initialContent = useMemo(
-    () =>
-      recollectionId && activePageId
-        ? getLogosContentForPage(recollectionId, activePageId) ?? undefined
-        : undefined,
-    [recollectionId, activePageId, reloadKey]
-  )
+  const initialContent = useMemo(() => {
+    if (!recollectionId || !activePageId) return undefined
+    const content = getLogosContentForPage(recollectionId, activePageId)
+    // BlockNote requires a non-empty array of blocks; use undefined for default empty doc.
+    if (!content || !Array.isArray(content) || content.length === 0) return undefined
+    return content
+  }, [recollectionId, activePageId, reloadKey])
 
   const editor = useCreateBlockNote(
     { schema: logosSchema, initialContent },