From 8a5a805588a49a8cc74306b61ced9c375eb5a2e6 Mon Sep 17 00:00:00 2001
From: pererinha <pererinha@gmail.com>
Date: Fri, 27 Dec 2013 15:02:12 -0200
Subject: [PATCH] partial #2252 - Historical Churn and Historical Churn Rate

---
 include/library/Crunchbutton/Chart/Churn.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/library/Crunchbutton/Chart/Churn.php b/include/library/Crunchbutton/Chart/Churn.php
index 19e6d29c3..6564f8f4b 100644
--- a/include/library/Crunchbutton/Chart/Churn.php
+++ b/include/library/Crunchbutton/Chart/Churn.php
@@ -82,7 +82,12 @@ class Crunchbutton_Chart_Churn extends Crunchbutton_Chart {
 			$activeForwardDaysPlusOne = $activeUsers[ ( $i + $daysForward + 1 ) ]->Total;
 			$newForwardDays = $newUsers[ ( $i + $daysForward ) ]->Total;
 			$newForwardDaysPlusOne = $newUsers[ ( $i + $daysForward +  1 ) ]->Total;
-			$churn = ( ( $activeForwardDays + $newForwardDaysPlusOne ) - $activeForwardDaysPlusOne );
+			if( $activeForwardDaysPlusOne > 0 ){
+				$churn = ( ( $activeForwardDays + $newForwardDaysPlusOne ) - $activeForwardDaysPlusOne );	
+			} else {
+				$churn = 0;
+			}
+			
 
 			$data[] = ( object ) array( 'Label' => $activeUsers[ $i ]->Label, 'Total' => $churn, 'Type' => 'Users' );
 		}