diff --git a/source/ubinstall-gtk-page-switch.c b/source/ubinstall-gtk-page-switch.c
index 65def82..ef05a46 100644
--- a/source/ubinstall-gtk-page-switch.c
+++ b/source/ubinstall-gtk-page-switch.c
@@ -430,14 +430,16 @@ void on_page_cancel_clicked(GtkWidget *, main_window *widgets){
     gtk_widget_set_sensitive(widgets->ConfigurationModeMenuItem,1);
         yon_page_update(widgets);
 
-    dialog_confirmation_data *data = yon_confirmation_dialog_data_new();
-    data->action_text=INTERRUPT_TEXT_LABEL;
-    data->title=WARNING_TITLE_LABEL;
-    if (yon_confirmation_dialog_call(widgets->MainWindow,data)==GTK_RESPONSE_ACCEPT ){
-        if (main_config.install_thread){
-            gtk_widget_hide(gtk_widget_get_parent(widgets->InstallationProgress));
-            gtk_widget_hide(gtk_widget_get_parent(widgets->PackageInstallationProgress));
-            pthread_cancel((pthread_t)main_config.install_thread);
+    if (main_config.install_thread){
+        dialog_confirmation_data *data = yon_confirmation_dialog_data_new();
+        data->action_text=INTERRUPT_TEXT_LABEL;
+        data->title=WARNING_TITLE_LABEL;
+        if (yon_confirmation_dialog_call(widgets->MainWindow,data)==GTK_RESPONSE_ACCEPT ){
+            if (main_config.install_thread){
+                gtk_widget_hide(gtk_widget_get_parent(widgets->InstallationProgress));
+                gtk_widget_hide(gtk_widget_get_parent(widgets->PackageInstallationProgress));
+                pthread_cancel((pthread_t)main_config.install_thread);
+            }
         }
     }
 }