diff --git a/lib/xlsx/xform/sheet/hyperlink-map.js b/lib/xlsx/xform/sheet/hyperlink-map.js
index ad76dca12..f3f78627b 100644
--- a/lib/xlsx/xform/sheet/hyperlink-map.js
+++ b/lib/xlsx/xform/sheet/hyperlink-map.js
@@ -25,7 +25,7 @@
 var HyperlinkMap = function(relationships, hyperlinks) {
   var rels = {};
   var map = this.map = {};
-  if (relationships) {
+  if (relationships && hyperlinks) {
     relationships.forEach(function (relationship) {
       rels[relationship.rId] = relationship.target;
     });