diff --git a/word/Math/NamesOfLiterals.js b/word/Math/NamesOfLiterals.js
index 849c48b2e3..2e73a35bbe 100644
--- a/word/Math/NamesOfLiterals.js
+++ b/word/Math/NamesOfLiterals.js
@@ -6572,6 +6572,9 @@
 	}
 	ProceedTokens.prototype.ProceedBeforeDivide = function (oRuleLast)
 	{
+		if (undefined === oRuleLast)
+			return false;
+
 		let oMathContentTemp = AscFormat.ExecuteNoHistory(
 			this.private_ProceedBeforeDivide,
 			this,