From cca28340becfd99c51bbd2e8eb644f7c8888c486 Mon Sep 17 00:00:00 2001
From: plegall <plg@piwigo.org>
Date: Fri, 29 Jan 2021 14:34:56 +0100
Subject: [PATCH] fixes #1304 activity table might be totally empty in the X
 last weeks

---
 admin/intro.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/admin/intro.php b/admin/intro.php
index e3ebbce1b..ad14b8ccf 100644
--- a/admin/intro.php
+++ b/admin/intro.php
@@ -321,7 +321,12 @@ for ($i=0; $i < $nb_weeks; $i++)
 }
 
 $size = 1;
-$chart_data[$temp_data[0]['w']][$temp_data[0]['d']] = $size;
+
+if (isset($temp_data[0]))
+{
+  $chart_data[$temp_data[0]['w']][$temp_data[0]['d']] = $size;
+}
+
 //Set sizes in chart data
 for ($i=1; $i < count($temp_data); $i++) 
 {