diff --git a/Classes/PHPExcel/Calculation/LookupRef.php b/Classes/PHPExcel/Calculation/LookupRef.php
index 94f42e5f2..4857046fb 100644
--- a/Classes/PHPExcel/Calculation/LookupRef.php
+++ b/Classes/PHPExcel/Calculation/LookupRef.php
@@ -606,6 +606,10 @@ public static function INDEX($arrayValues,$rowNum = 0,$columnNum = 0) {
 			return PHPExcel_Calculation_Functions::VALUE();
 		}
 
+		if (PHPExcel_Calculation_Functions::IS_ERROR($rowNum)) {
+			return $rowNum;
+		}
+
 		if (!is_array($arrayValues)) {
 			return PHPExcel_Calculation_Functions::REF();
 		}