1 files changed, 5 insertions, 1 deletions
diff --git a/lib/docx/numbering-xml.js b/lib/docx/numbering-xml.js
index 24fb7e4..028bf01 100644
--- a/lib/docx/numbering-xml.js
+++ b/lib/docx/numbering-xml.js
@@ -15,7 +15,11 @@ function Numbering(nums, abstractNums) {
     };
 }
 
-function readNumberingXml(root) {
+function readNumberingXml(root, options) {
+    if (!options || !options.styles) {
+        throw new Error("styles is missing");
+    }
+
     var abstractNums = readAbstractNums(root);
     var nums = readNums(root, abstractNums);
     return new Numbering(nums, abstractNums);