fix : update

components/admin/extra-sheet-editor.tsx

@@ -223,7 +223,7 @@ export function ExtraSheetEditor({
             type="color"
             aria-label="เลือกสีพื้นหลังเซลล์"
             className="absolute inset-0 cursor-pointer opacity-0"
-            value={activeRow?.backgrounds[activeColumn?.id ?? ""] ?? DEFAULT_CELL_BACKGROUND}
+            value={activeRow?.backgrounds?.[activeColumn?.id ?? ""] ?? DEFAULT_CELL_BACKGROUND}
             onChange={(event) => onChange(updateExtraSheetCells(value, selectedPoints(), {
               backgroundColor: event.target.value,
             }))}

components/public/structured-guide.tsx

@@ -1288,7 +1288,7 @@ function ExtraSectionContent({
                           <TableCell
                             key={column.id}
                             className="border-l first:border-l-0 whitespace-normal"
-                            style={sheetRow.backgrounds[column.id]
+                            style={sheetRow.backgrounds?.[column.id]
                               ? { backgroundColor: sheetRow.backgrounds[column.id] }
                               : undefined}
                           >