fix that ed8d2958 break tests

1602d4b9 · Sergey Konovalov · 976e4a17 · 1602d4b9
Commit 1602d4b9 authored Oct 31, 2017 by Sergey Konovalov
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cell/model/WorkbookElems.js cell/model/WorkbookElems.js +1 -1

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--- a/cell/model/WorkbookElems.js
+++ b/cell/model/WorkbookElems.js
@@ -2805,7 +2805,7 @@ StyleManager.prototype =
 		return this.xfs.list.length;
 	};
 	StyleCache.prototype._add = function(container, newVal) {
-		if (undefined === newVal.getIndexNumber()) {
+		if (newVal && undefined === newVal.getIndexNumber()) {
 			var hash = newVal.getHash();
 			var res = container.vals[hash];
 			if (!res) {