1 files changed, 12 insertions, 6 deletions

diff --git a/scripts/metadata_filter.lua b/scripts/metadata_filter.lua
index b6df703..4014db4 100644
--- a/scripts/metadata_filter.lua
+++ b/scripts/metadata_filter.lua
@@ -218,11 +218,9 @@ function generate_list(meta)
         end)
     elseif meta.depth == "3" then
         return meta.pages.all:map(function(cat)
-            return {
-                title = cat.title,
-                content = cat.content,
-                url = cat.url,
-                grid = cat.list_grid,
+            local items = pandoc.List()
+
+            if cat.pages then
                 items = cat.pages.all:flatMap(function(c)
                     if c.pages then
                         return c.pages.all:map(function(p)
@@ -248,7 +246,15 @@ function generate_list(meta)
                         })
                         return l
                     end
-                end),
+                end)
+            end
+
+            return {
+                title = cat.title,
+                content = cat.content,
+                url = cat.url,
+                grid = cat.list_grid,
+                items = items,
             }
         end)
     end