diff --git a/gui/newgui.cpp b/gui/newgui.cpp
index ec7fb3802da..f280b308c7e 100644
--- a/gui/newgui.cpp
+++ b/gui/newgui.cpp
@@ -116,7 +116,7 @@ void NewGui::runLoop()
 		didSaveState = true;
 	}
 
-	while (activeDialog == _dialogStack.top()) {
+	while (!_dialogStack.empty() && activeDialog == _dialogStack.top()) {
 
 		activeDialog->handleTickle();