diff --git a/src/common/Export.cpp b/src/common/Export.cpp
index c3aec4cf1d2131c113b7ce4686bfd7b96082e48c..80b2f44105bd11a1994371ddaa7f6f9933d7cc4f 100644
--- a/src/common/Export.cpp
+++ b/src/common/Export.cpp
@@ -209,7 +209,7 @@ void Export::open_export_window(QWidget *parent, RenderLayout *render_layout) {
 
 void Export::open_export_variable_window(const std::map<std::string, Variable *> &variable_list, const std::string &export_filename) {
     Ui_counter_choice_box export_variable_window;
-    QDialog dialog_box;
+    QDialog dialog_box(nullptr);
     export_variable_window.setupUi(&dialog_box);
 
     for (std::map<std::string, Variable *>::const_iterator it = variable_list.begin();