From bbafe98cf379fa62913bc5f98c8a6566dec58d3b Mon Sep 17 00:00:00 2001
From: Graham McNicoll <gunkemail@yahoo.com>
Date: Mon, 30 Nov 2015 18:04:54 -0800
Subject: [PATCH] Fixed error with undefined $letter variable

---
 classes/report_formats/XlsReportBase.php | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/classes/report_formats/XlsReportBase.php b/classes/report_formats/XlsReportBase.php
index ee07c3b3..720e40b2 100644
--- a/classes/report_formats/XlsReportBase.php
+++ b/classes/report_formats/XlsReportBase.php
@@ -3,7 +3,8 @@ abstract class XlsReportBase extends ReportFormatBase {
 	private static function columnLetter($c){
 		$c = intval($c);
 		if ($c <= 0) return '';
-
+		$letter = '';
+		
 		while($c != 0){
 			$p = ($c - 1) % 26;
 			$c = intval(($c - $p) / 26);