From 0d1ff5b95fc63f1073f9b896f9a3981d36d927d6 Mon Sep 17 00:00:00 2001
From: Adrien Crivelli <adrien.crivelli@gmail.com>
Date: Tue, 28 Feb 2017 10:50:22 +0900
Subject: [PATCH] Better exception message for new Excel functions

Closes https://github.com/PHPOffice/PHPExcel/issues/1136
---
 src/PhpSpreadsheet/Calculation.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/PhpSpreadsheet/Calculation.php b/src/PhpSpreadsheet/Calculation.php
index 930bf9ea..8dc957d3 100644
--- a/src/PhpSpreadsheet/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation.php
@@ -3764,6 +3764,11 @@ class Calculation
                 } elseif (preg_match('/^' . self::CALCULATION_REGEXP_NAMEDRANGE . '$/i', $token, $matches)) {
                     $namedRange = $matches[6];
                     $this->debugLog->writeDebugLog('Evaluating Named Range ', $namedRange);
+
+                    if (substr($namedRange, 0, 6) === '_xlfn.') {
+                        return $this->raiseFormulaError("undefined named range / function '$token'");
+                    }
+
                     $cellValue = $this->extractNamedRange($namedRange, ((null !== $pCell) ? $pCellWorksheet : null), false);
                     $pCell->attach($pCellParent);
                     $this->debugLog->writeDebugLog('Evaluation Result for named range ', $namedRange, ' is ', $this->showTypeDetails($cellValue));