Fix empty div headers error in lua filter

carpentries · Apr 19, 2024 · b8c9a94 · b8c9a94
1 parent 415d3b9
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diff --git a/NEWS.md b/NEWS.md
@@ -1,3 +1,11 @@
+# sandpaper 0.16.5.9000 (2024-04-19)
+
+## BUG FIXES
+
+* Fix for empty divs when checking for headers
+  (reported: @dmgatti, #581; fixed @froggleston)
+
+
 # sandpaper 0.16.4 (2024-04-10)
 
 ## NEW FEATURES

diff --git a/inst/rmarkdown/lua/lesson.lua b/inst/rmarkdown/lua/lesson.lua
@@ -152,6 +152,11 @@ function level_head(el, level)
   local id = 1
   local header = el.content[id]
 
+  -- fix for https://github.com/carpentries/sandpaper/issues/581
+  if header == nil then
+    return el
+  end
+
   if level ~= 0 and header.level == nil then
     -- capitalize the first letter and insert it at the top of the block
     local C = text.upper(text.sub(class, 1, 1))