Handle w:num with invalid w:abstractNumId

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/docx/numbering-xml.js b/lib/docx/numbering-xml.js
index 64c4210..832e414 100644
--- a/lib/docx/numbering-xml.js
+++ b/lib/docx/numbering-xml.js
@@ -20,7 +20,9 @@ function Numbering(nums, abstractNums, styles) {
         var num = nums[numId];
         if (num) {
             var abstractNum = abstractNums[num.abstractNumId];
-            if (abstractNum.numStyleLink == null) {
+            if (!abstractNum) {
+                return null;
+            } else if (abstractNum.numStyleLink == null) {
                 return abstractNums[num.abstractNumId].levels[level];
             } else {
                 var style = styles.findNumberingStyleById(abstractNum.numStyleLink);