diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
index c4e23b81..f342396f 100644
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -1109,6 +1109,7 @@ void MainWindow::clearProjectUI() {
 
     // Clear map list
     mapListModel->clear();
+    mapListIndexes.clear();
     mapGroupItemsList->clear();
 }
 
@@ -1125,6 +1126,7 @@ void MainWindow::sortMapList() {
 
     ui->mapList->setUpdatesEnabled(false);
     mapListModel->clear();
+    mapListIndexes.clear();
     mapGroupItemsList->clear();
     QStandardItem *root = mapListModel->invisibleRootItem();