From fd69efb060d9625db35bd9fabfbd172eb016b3ca Mon Sep 17 00:00:00 2001
From: Volker Fischer <corrados@users.noreply.github.com>
Date: Sun, 6 Mar 2016 10:39:59 +0000
Subject: [PATCH] bug fix with the history graph plotting (an invalid point was
 added to the graph)

---
 src/serverlogging.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/serverlogging.cpp b/src/serverlogging.cpp
index a2c5fa5d..5c1f2f50 100755
--- a/src/serverlogging.cpp
+++ b/src/serverlogging.cpp
@@ -298,7 +298,11 @@ void CHistoryGraph::Update()
         // add markers
         for ( i = 0; i < iNumItemsForHistory; i++ )
         {
-            AddMarker ( vHistoryDataFifo[i] );
+            // only use valid dates
+            if ( vHistoryDataFifo[i].DateTime.date().isValid() )
+            {
+                AddMarker ( vHistoryDataFifo[i] );
+            }
         }
 
         // save graph as picture in file