diff --git a/src/barchart/qbarseries.cpp b/src/barchart/qbarseries.cpp
index dac0e68..a8b92a1 100644
--- a/src/barchart/qbarseries.cpp
+++ b/src/barchart/qbarseries.cpp
@@ -37,6 +37,10 @@ QBarSeries::QBarSeries(QStringList categories, QObject *parent)
     : QSeries(parent)
     ,mModel(new BarChartModel(categories, this))
 {
+    m_model = NULL;
+    m_mapCategories = -1;
+    m_mapBarBottom - 1;
+    m_mapBarTop - 1;
 }
 
 /*!