From 289c19d8c9342a3fe5b8869371634ee93809e83e Mon Sep 17 00:00:00 2001
From: Mark Watkins <jedimark@users.sourceforge.net>
Date: Tue, 16 Sep 2014 12:48:52 +1000
Subject: [PATCH] fix gSessionTimesChart segfault

---
 sleepyhead/Graphs/gSessionTimesChart.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sleepyhead/Graphs/gSessionTimesChart.cpp b/sleepyhead/Graphs/gSessionTimesChart.cpp
index 272161bf..91da9ab6 100644
--- a/sleepyhead/Graphs/gSessionTimesChart.cpp
+++ b/sleepyhead/Graphs/gSessionTimesChart.cpp
@@ -844,7 +844,8 @@ void gSessionTimesChart::paint(QPainter &painter, gGraph &graph, const QRegion &
     /////////////////////////////////////////////////////////////////////
     peak_value = 0;
     min_value = 999;
-    for (int i=idx; i <= idx_end; ++i, ++it2) {
+    QMap<QDate, int>::iterator it_end = dayindex.end();
+    for (int i=idx; (i <= idx_end) && (it2 != it_end); ++i, ++it2) {
         Day * day = daylist.at(i);
 
         if (!day)