Index: src/mainwindow.cpp
===================================================================
--- src/mainwindow.cpp
+++ src/mainwindow.cpp
@@ -165,7 +165,11 @@
             break;
         default:
             ChooseFileDialog dialog(this, m_openFiles);
-            if (dialog.exec() == QDialog::Accepted) {
+            int result = dialog.exec();
+            if (result == QDialog::Rejected) {
+                return;
+            }
+            if (result == QDialog::Accepted) {
                 file = dialog.choosenFile();
             }
             break;