From 7f9b32e36a8fdfe3efdcdb05b84cafd297641d85 Mon Sep 17 00:00:00 2001
From: Albert Krewinkel <albert@zeitkraut.de>
Date: Tue, 11 Jun 2019 19:39:42 +0200
Subject: data/pandoc.lua: fix deletion of nonexistent attributes

Fixes: #5569
---
 data/pandoc.lua | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'data')

diff --git a/data/pandoc.lua b/data/pandoc.lua
index 8a45a39e9..859ecedc4 100644
--- a/data/pandoc.lua
+++ b/data/pandoc.lua
@@ -846,7 +846,10 @@ local AttributeList = {
 
   __newindex = function (t, k, v)
     local cur, idx = List.find_if(t, assoc_key_equals(k))
-    if v == nil then
+    if v == nil and not cur then
+      -- deleted key does not exists in list
+      return
+    elseif v == nil then
       table.remove(t, idx)
     elseif cur then
       cur[2] = v
-- 
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