diff --git a/core/include/Data/DataSeries.h b/core/include/Data/DataSeries.h
index 19df6c8..f9de7dc 100644
--- a/core/include/Data/DataSeries.h
+++ b/core/include/Data/DataSeries.h
@@ -31,12 +31,12 @@ public:
 
 protected:
     /// Protected ctor (DataSeries is abstract)
-    explicit DataSeries(std::shared_ptr<ArrayData<1> > xAxisData, Unit xAxisUnit,
-                        std::shared_ptr<ArrayData<Dim> > valuesData, Unit valuesUnit)
+    explicit DataSeries(std::shared_ptr<ArrayData<1> > xAxisData, const Unit &xAxisUnit,
+                        std::shared_ptr<ArrayData<Dim> > valuesData, const Unit &valuesUnit)
             : m_XAxisData{xAxisData},
-              m_XAxisUnit{std::move(xAxisUnit)},
+              m_XAxisUnit{xAxisUnit},
               m_ValuesData{valuesData},
-              m_ValuesUnit{std::move(valuesUnit)}
+              m_ValuesUnit{valuesUnit}
     {
     }
 
diff --git a/core/include/Data/ScalarSeries.h b/core/include/Data/ScalarSeries.h
index e740bec..69d68e1 100644
--- a/core/include/Data/ScalarSeries.h
+++ b/core/include/Data/ScalarSeries.h
@@ -14,7 +14,7 @@ public:
      * @param xAxisUnit x-axis unit
      * @param valuesUnit values unit
      */
-    explicit ScalarSeries(int size, Unit xAxisUnit, Unit valuesUnit);
+    explicit ScalarSeries(int size, const Unit &xAxisUnit, const Unit &valuesUnit);
 
     /**
      * Sets data for a specific index. The index has to be valid to be effective
diff --git a/core/src/Data/ScalarSeries.cpp b/core/src/Data/ScalarSeries.cpp
index bd07739..90718a5 100644
--- a/core/src/Data/ScalarSeries.cpp
+++ b/core/src/Data/ScalarSeries.cpp
@@ -1,8 +1,8 @@
 #include <Data/ScalarSeries.h>
 
-ScalarSeries::ScalarSeries(int size, Unit xAxisUnit, Unit valuesUnit)
-        : DataSeries{std::make_shared<ArrayData<1> >(size), std::move(xAxisUnit),
-                     std::make_shared<ArrayData<1> >(size), std::move(valuesUnit)}
+ScalarSeries::ScalarSeries(int size, const Unit &xAxisUnit, const Unit &valuesUnit)
+        : DataSeries{std::make_shared<ArrayData<1> >(size), xAxisUnit,
+                     std::make_shared<ArrayData<1> >(size), valuesUnit}
 {
 }
 
diff --git a/gui/src/Visualization/VisualizationWidget.cpp b/gui/src/Visualization/VisualizationWidget.cpp
index c780ec8..6011c5a 100644
--- a/gui/src/Visualization/VisualizationWidget.cpp
+++ b/gui/src/Visualization/VisualizationWidget.cpp
@@ -20,7 +20,7 @@ VisualizationWidget::VisualizationWidget(QWidget *parent)
     addTabViewButton->setCursor(Qt::ArrowCursor);
     ui->tabWidget->setCornerWidget(addTabViewButton, Qt::TopRightCorner);
 
-    auto enableMinimunCornerWidgetSize = [this](bool enable) {
+    auto enableMinimumCornerWidgetSize = [this](bool enable) {
 
         auto tabViewCornerWidget = ui->tabWidget->cornerWidget();
         auto width = enable ? tabViewCornerWidget->width() : 0;
@@ -31,18 +31,18 @@ VisualizationWidget::VisualizationWidget(QWidget *parent)
         ui->tabWidget->setMinimumWidth(width);
     };
 
-    auto addTabView = [this, enableMinimunCornerWidgetSize]() {
+    auto addTabView = [this, enableMinimumCornerWidgetSize]() {
         auto index = ui->tabWidget->addTab(new VisualizationTabWidget(ui->tabWidget),
                                            QString("View %1").arg(ui->tabWidget->count() + 1));
         if (ui->tabWidget->count() > 0) {
-            enableMinimunCornerWidgetSize(false);
+            enableMinimumCornerWidgetSize(false);
         }
         qCInfo(LOG_VisualizationWidget()) << tr("add the tab of index %1").arg(index);
     };
 
-    auto removeTabView = [this, enableMinimunCornerWidgetSize](int index) {
+    auto removeTabView = [this, enableMinimumCornerWidgetSize](int index) {
         if (ui->tabWidget->count() == 1) {
-            enableMinimunCornerWidgetSize(true);
+            enableMinimumCornerWidgetSize(true);
         }
 
         ui->tabWidget->removeTab(index);
@@ -101,17 +101,17 @@ void VisualizationWidget::displayVariable(std::shared_ptr<Variable> variable) no
                 newGraph->addVariable(variable);
             }
             else {
-                qCDebug(LOG_VisualizationWidget())
+                qCCritical(LOG_VisualizationWidget())
                     << tr("Can't display the variable : can't create the graph");
             }
         }
         else {
-            qCDebug(LOG_VisualizationWidget())
+            qCCritical(LOG_VisualizationWidget())
                 << tr("Can't display the variable : can't create a new zone in the current tab");
         }
     }
     else {
-        qCDebug(LOG_VisualizationWidget())
+        qCCritical(LOG_VisualizationWidget())
             << tr("Can't display the variable : there is no current tab");
     }
 }