Ensure we don't use null style ID for finding numbering

This should be redundant since we filter out nulls as keys.

1 files changed, 5 insertions, 3 deletions

diff --git a/lib/docx/body-reader.js b/lib/docx/body-reader.js
index 2979a38..2616dde 100644
--- a/lib/docx/body-reader.js
+++ b/lib/docx/body-reader.js
@@ -499,9 +499,11 @@ function BodyReader(options) {
 
 
 function readNumberingProperties(styleId, element, numbering) {
-    var levelByStyleId = numbering.findLevelByParagraphStyleId(styleId);
-    if (levelByStyleId != null) {
-        return levelByStyleId;
+    if (styleId != null) {
+        var levelByStyleId = numbering.findLevelByParagraphStyleId(styleId);
+        if (levelByStyleId != null) {
+            return levelByStyleId;
+        }
     }
 
     var level = element.firstOrEmpty("w:ilvl").attributes["w:val"];