Handle AlternateContent without Fallback in office-xml-reader

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/docx/office-xml-reader.js b/lib/docx/office-xml-reader.js
index 43e5250..792cd7c 100644
--- a/lib/docx/office-xml-reader.js
+++ b/lib/docx/office-xml-reader.js
@@ -62,7 +62,7 @@ function stripUtf8Bom(xmlString) {
 function collapseAlternateContent(node) {
     if (node.type === "element") {
         if (node.name === "mc:AlternateContent") {
-            return node.first("mc:Fallback").children;
+            return node.firstOrEmpty("mc:Fallback").children;
         } else {
             node.children = _.flatten(node.children.map(collapseAlternateContent, true));
             return [node];