diff --git a/src/pyj/read_book/toc.pyj b/src/pyj/read_book/toc.pyj
index e70797613e..a053616707 100644
--- a/src/pyj/read_book/toc.pyj
+++ b/src/pyj/read_book/toc.pyj
@@ -21,8 +21,11 @@ def get_highlighted_toc_nodes(toc, parent_map, id_map):
     ans = {}
     if data.has_visible:
         ans = data.visible_anchors
-    elif data.before:
-        ans[data.before] = True
+    else:
+        if data.before:
+            ans[data.before] = True
+        else:
+            pass  # TODO: implement this
     for node_id in Object.keys(ans):
         pid = parent_map[node_id]
         while pid: