fix #39463; added dummy disablejfam option in classes

[luatex-ja/luatexja.git] / src / ltj-math.lua

diff --git a/src/ltj-math.lua b/src/ltj-math.lua
index e85e5f7..53bcdb3 100644 (file)
--- a/src/ltj-math.lua
+++ b/src/ltj-math.lua
@@ -169,9 +169,9 @@ luatexbase.add_to_callback('mlist_to_hlist',
    function (n, display_type, penalties)
       n = to_direct(n); list_dir = ltjd_get_dir_count()
       if getid(n)==id_whatsit and getsubtype(n)==sid_user and
-      getfield(n, 'user_id') == DIR then
+        getfield(n, 'user_id') == DIR then
         local old_n = n; n = node_remove(n, n)
-        node_free(old_n)
+        node_free(old_n); if not n then return nil end
       end
       return node.mlist_to_hlist(
         to_node(conv_jchar_to_hbox(n, 0)),