diff --git a/core/src/Variable/VariableModel.cpp b/core/src/Variable/VariableModel.cpp
index af16df1..044b2a9 100644
--- a/core/src/Variable/VariableModel.cpp
+++ b/core/src/Variable/VariableModel.cpp
@@ -46,7 +46,7 @@ VariableModel::createVariable(const QString &name, const SqpDateTime &dateTime,
 
 std::shared_ptr<Variable> VariableModel::variable(int index) const
 {
-    return (index >= 0 && index < impl->m_Variables.size()) ? impl->m_Variables.at(index) : nullptr;
+    return (index >= 0 && index < impl->m_Variables.size()) ? impl->m_Variables[index] : nullptr;
 }
 
 int VariableModel::columnCount(const QModelIndex &parent) const
diff --git a/gui/include/Variable/VariableInspectorWidget.h b/gui/include/Variable/VariableInspectorWidget.h
index 6adb0a0..cc6faee 100644
--- a/gui/include/Variable/VariableInspectorWidget.h
+++ b/gui/include/Variable/VariableInspectorWidget.h
@@ -1,11 +1,14 @@
 #ifndef SCIQLOP_VARIABLEINSPECTORWIDGET_H
 #define SCIQLOP_VARIABLEINSPECTORWIDGET_H
 
+#include <QLoggingCategory>
 #include <QMenu>
 #include <QWidget>
 
 #include <memory>
 
+Q_DECLARE_LOGGING_CATEGORY(LOG_VariableInspectorWidget)
+
 class Variable;
 
 namespace Ui {
diff --git a/gui/src/Variable/VariableInspectorWidget.cpp b/gui/src/Variable/VariableInspectorWidget.cpp
index 0c8dfaa..a31c7d0 100644
--- a/gui/src/Variable/VariableInspectorWidget.cpp
+++ b/gui/src/Variable/VariableInspectorWidget.cpp
@@ -8,6 +8,8 @@
 
 #include <SqpApplication.h>
 
+Q_LOGGING_CATEGORY(LOG_VariableInspectorWidget, "VariableInspectorWidget")
+
 VariableInspectorWidget::VariableInspectorWidget(QWidget *parent)
         : QWidget{parent}, ui{new Ui::VariableInspectorWidget}
 {
@@ -47,4 +49,9 @@ void VariableInspectorWidget::onTableMenuRequested(const QPoint &pos) noexcept
             }
         }
     }
+    else {
+        qCCritical(LOG_VariableInspectorWidget())
+            << tr("Can't display menu : invalid index (%1;%2)")
+                   .arg(selectedIndex.row(), selectedIndex.column());
+    }
 }