diff --git a/Modules/Chart/include/QmitkChartxyData.h b/Modules/Chart/include/QmitkChartxyData.h
index 8ab595849d..c477050f1d 100644
--- a/Modules/Chart/include/QmitkChartxyData.h
+++ b/Modules/Chart/include/QmitkChartxyData.h
@@ -1,157 +1,157 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #ifndef QmitkC3xyData_h
 #define QmitkC3xyData_h
 
 #include <QVariant>
 
 /** /brief This class holds the actual data for the chart generation with C3.
  * data can be loaded in constructor directly or with SetData
  * It is derived from QObject, because we need Q_PROPERTIES to send Data via QWebChannel to JavaScript.
  */
 class QmitkChartxyData : public QObject
 {
   Q_OBJECT
 
   Q_PROPERTY(QVariant m_LabelCount READ GetLabelCount CONSTANT);
   Q_PROPERTY(QList<QVariant> m_YData READ GetYData WRITE SetYData NOTIFY SignalYDataChanged);
   Q_PROPERTY(QList<QVariant> m_XData READ GetXData WRITE SetXData NOTIFY SignalXDataChanged);
   Q_PROPERTY(
     QList<QVariant> m_XErrorDataPlus READ GetXErrorDataPlus WRITE SetXErrorDataPlus NOTIFY SignalErrorDataChanged);
   Q_PROPERTY(
     QList<QVariant> m_XErrorDataMinus READ GetXErrorDataMinus WRITE SetXErrorDataMinus NOTIFY SignalErrorDataChanged);
   Q_PROPERTY(
     QList<QVariant> m_YErrorDataPlus READ GetYErrorDataPlus WRITE SetYErrorDataPlus NOTIFY SignalErrorDataChanged);
   Q_PROPERTY(
     QList<QVariant> m_YErrorDataMinus READ GetYErrorDataMinus WRITE SetYErrorDataMinus NOTIFY SignalErrorDataChanged);
   Q_PROPERTY(QVariant m_ChartType READ GetChartType WRITE SetChartType NOTIFY SignalDiagramTypeChanged);
   Q_PROPERTY(QVariant m_Color READ GetColor WRITE SetColor NOTIFY SignalColorChanged);
   Q_PROPERTY(QVariant m_Label READ GetLabel WRITE SetLabel NOTIFY SignalLabelChanged);
   Q_PROPERTY(QVariant m_LineStyleName READ GetLineStyle WRITE SetLineStyle NOTIFY SignalLineStyleChanged);
 
 public:
   explicit QmitkChartxyData(const QMap<QVariant, QVariant> &data,
                             const QVariant &label,
                             const QVariant &diagramType,
                             const QVariant &position); // Constructor for Data2D (x:y=1:2, 2:6, 3:7)
 
   void SetData(const QMap<QVariant, QVariant> &data);
 
   Q_INVOKABLE QVariant GetLabelCount() const { return m_LabelCount; }
 
   Q_INVOKABLE QList<QVariant> GetYData() const { return m_YData; };
   Q_INVOKABLE void SetYData(const QList<QVariant> &yData)
   {
     m_YData = yData;
     emit SignalYDataChanged(yData);
   };
 
   Q_INVOKABLE QList<QVariant> GetXData() const { return m_XData; };
   Q_INVOKABLE void SetXData(const QList<QVariant> &xData)
   {
     m_XData = xData;
     emit SignalXDataChanged(xData);
   };
 
   Q_INVOKABLE QList<QVariant> GetXErrorDataPlus() const { return m_XErrorDataPlus; };
   Q_INVOKABLE void SetXErrorDataPlus(const QList<QVariant> &errorData)
   {
     m_XErrorDataPlus = errorData;
     emit SignalErrorDataChanged(errorData);
   };
 
   Q_INVOKABLE QList<QVariant> GetXErrorDataMinus() const { return m_XErrorDataMinus; };
   Q_INVOKABLE void SetXErrorDataMinus(const QList<QVariant> &errorData)
   {
     m_XErrorDataMinus = errorData;
     emit SignalErrorDataChanged(errorData);
   };
 
   Q_INVOKABLE QList<QVariant> GetYErrorDataPlus() const { return m_YErrorDataPlus; };
   Q_INVOKABLE void SetYErrorDataPlus(const QList<QVariant> &errorData)
   {
     m_YErrorDataPlus = errorData;
     emit SignalErrorDataChanged(errorData);
   };
 
   Q_INVOKABLE QList<QVariant> GetYErrorDataMinus() const { return m_YErrorDataMinus; };
   Q_INVOKABLE void SetYErrorDataMinus(const QList<QVariant> &errorData)
   {
     m_YErrorDataMinus = errorData;
     emit SignalErrorDataChanged(errorData);
   };
 
   Q_INVOKABLE QVariant GetChartType() const { return m_ChartType; };
   Q_INVOKABLE void SetChartType(const QVariant &chartType)
   {
     m_ChartType = chartType;
     emit SignalDiagramTypeChanged(chartType);
   };
 
   Q_INVOKABLE QVariant GetLabel() const { return m_Label; };
   Q_INVOKABLE void SetLabel(const QVariant &label)
   {
     m_Label = label;
     emit SignalLabelChanged(label);
   };
 
   Q_INVOKABLE QVariant GetColor() const { return m_Color; };
   Q_INVOKABLE void SetColor(const QVariant &color)
   {
     m_Color = color;
     emit SignalColorChanged(color);
   };
 
   Q_INVOKABLE QVariant GetLineStyle() const { return m_LineStyleName; };
   Q_INVOKABLE void SetLineStyle(const QVariant &lineStyle)
   {
     m_LineStyleName = lineStyle;
     emit SignalLineStyleChanged(lineStyle);
   };
 
   /**
    * \brief Clears the Data.
    *
    * This function clears the data.
    */
   void ClearData();
 
 signals:
   void SignalYDataChanged(const QList<QVariant> yData);
   void SignalXDataChanged(const QList<QVariant> xData);
   void SignalErrorDataChanged(const QList<QVariant> errorData);
   void SignalDiagramTypeChanged(const QVariant diagramType);
   void SignalColorChanged(const QVariant color);
   void SignalLabelChanged(const QVariant label);
   void SignalLineStyleChanged(const QVariant lineStyle);
 
 private:
   /** js needs to know which label position in the list QmitkChartWidget::Impl::m_C3xyData it has for updating the values*/
   const QVariant m_LabelCount;
   QList<QVariant> m_YData;
   QList<QVariant> m_XData;
   QList<QVariant> m_XErrorDataPlus;
   QList<QVariant> m_XErrorDataMinus;
   QList<QVariant> m_YErrorDataPlus;
   QList<QVariant> m_YErrorDataMinus;
   QVariant m_Label;
   QVariant m_ChartType;
-  QVariant m_Color;
-  QVariant m_LineStyleName;
+  QVariant m_Color = "";
+  QVariant m_LineStyleName = "solid";
 };
 
 #endif // QmitkC3xyData_h