From c69ea62ed5e7d5ef046d7d00772d9bb7b100daf6 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 9 Aug 2026 14:52:51 +0100
Subject: Ignore numbering levels that use numStyleLink to refer to themselves

---
 lib/docx/numbering-xml.js | 31 ++++++++++++++++++++-----------
 1 file changed, 20 insertions(+), 11 deletions(-)

(limited to 'lib/docx')

diff --git a/lib/docx/numbering-xml.js b/lib/docx/numbering-xml.js
index 544ba52..9c86536 100644
--- a/lib/docx/numbering-xml.js
+++ b/lib/docx/numbering-xml.js
@@ -17,20 +17,29 @@ function Numbering(nums, abstractNums, styles) {
     );
 
     function findLevel(numId, level) {
+        return findLevelWithSeenNumIds(numId, level, {});
+    }
+
+    function findLevelWithSeenNumIds(numId, level, seenNumIds) {
+        if (seenNumIds[numId]) {
+            return null;
+        }
+        seenNumIds[numId] = true;
+
         var num = nums[numId];
-        if (num) {
-            var abstractNum = abstractNums[num.abstractNumId];
-            if (!abstractNum) {
-                return null;
-            } else if (abstractNum.numStyleLink == null) {
-                return abstractNums[num.abstractNumId].levels[level];
-            } else {
-                var style = styles.findNumberingStyleById(abstractNum.numStyleLink);
-                return findLevel(style.numId, level);
-            }
-        } else {
+        if (!num) {
             return null;
         }
+
+        var abstractNum = abstractNums[num.abstractNumId];
+        if (!abstractNum) {
+            return null;
+        } else if (abstractNum.numStyleLink == null) {
+            return abstractNums[num.abstractNumId].levels[level];
+        } else {
+            var style = styles.findNumberingStyleById(abstractNum.numStyleLink);
+            return findLevelWithSeenNumIds(style.numId, level, seenNumIds);
+        }
     }
 
     function findLevelByParagraphStyleId(styleId) {
-- 
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