1 files changed, 5 insertions, 0 deletions
diff --git a/mappingtreewidget.cpp b/mappingtreewidget.cpp
index 01582e5..67ccd87 100644
--- a/mappingtreewidget.cpp
+++ b/mappingtreewidget.cpp
@@ -121,6 +121,11 @@ void MappingTreeWidget::addChild(){
     if(value.isEmpty()){
         return;
     }
+    if(value.contains(mModel->forbidden())){
+        QString msg = QString(tr("Value contains illegal string \"%1\"")).arg(mModel->forbidden());
+        QMessageBox::critical(this, tr("Error"), msg);
+        return;
+    }
     QModelIndex real = mProxy->mapToSource(sel);
     mModel->addChild(value, real);
 }