diff --git a/mainwindow.cpp b/mainwindow.cpp
index 0ba6064..9edee31 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -52,19 +52,15 @@ void MainWindow::onGridUpdated()
     {
         if (iter->size() > 1)
         {
-            QTreeWidgetItem *topItem = new QTreeWidgetItem(ui->treeWarnings, QStringList{
-                QString("Color \"%1\" is used by several lines:").arg(iter.key())
-            });
+            QString warningTitle = QString("Color \"%1\" is used by several lines:").arg(iter.key());
+            QStringList warningDescription{};
 
             for(int i = 0; i < iter->size(); i++)
             {
-                QTreeWidgetItem *innerItem = new QTreeWidgetItem(topItem, QStringList {
-                    QString("Line #%1").arg(iter->at(i))
-                });
-                topItem->addChild(innerItem);
+                warningDescription.push_back(QString("Line #%1").arg(iter->at(i)));
             }
 
-            ui->treeWarnings->addTopLevelItem(topItem);
+            throwWarning(warningTitle, warningDescription);
         }
     }
     ui->treeWarnings->expandAll();
@@ -122,6 +118,17 @@ bool MainWindow::isSelectedLineCorrect(int line)
     return line >= 0 && line < size && size > 0;
 }
 
+void MainWindow::throwWarning(const QString &title, const QStringList &description)
+{
+    QTreeWidgetItem *titleItem = new QTreeWidgetItem(ui->treeWarnings, QStringList{ title });
+    for (auto iter = description.begin(); iter != description.end(); iter++)
+    {
+        QTreeWidgetItem *descriptionItem = new QTreeWidgetItem(titleItem, QStringList{ *iter });
+        titleItem->addChild(descriptionItem);
+    }
+    ui->treeWarnings->addTopLevelItem(titleItem);
+}
+
 
 void MainWindow::on_buttonSave_clicked()
 {
diff --git a/mainwindow.h b/mainwindow.h
index fed122c..83381e9 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -41,5 +41,6 @@ private:
     int lastEditedLine = -1;
 
     bool isSelectedLineCorrect(int line);
+    void throwWarning(const QString &title, const QStringList &description);
 };
 #endif // MAINWINDOW_H