diff --git a/radio/src/gui/colorlcd/fullscreen_dialog.cpp b/radio/src/gui/colorlcd/fullscreen_dialog.cpp
index 727970d9a..23bff4b99 100644
--- a/radio/src/gui/colorlcd/fullscreen_dialog.cpp
+++ b/radio/src/gui/colorlcd/fullscreen_dialog.cpp
@@ -25,10 +25,17 @@
 #include "opentx.h"
 #include "libopenui.h"
 
+static Window* _get_parent()
+{
+  Window* p = Layer::back();
+  if (!p) p = MainWindow::instance();
+  return p;
+}
+
 FullScreenDialog::FullScreenDialog(
     uint8_t type, std::string title, std::string message, std::string action,
     const std::function<void(void)>& confirmHandler) :
-    Window(Layer::back(), {0, 0, LCD_W, LCD_H}, OPAQUE),
+    Window(_get_parent(), {0, 0, LCD_W, LCD_H}, OPAQUE),
     type(type),
     title(std::move(title)),
     message(std::move(message)),
diff --git a/radio/src/thirdparty/libopenui b/radio/src/thirdparty/libopenui
index 7b2fb8300..fbb92f83c 160000
--- a/radio/src/thirdparty/libopenui
+++ b/radio/src/thirdparty/libopenui
@@ -1 +1 @@
-Subproject commit 7b2fb8300531a6be5348114b6a60093e50970a65
+Subproject commit fbb92f83cf49af11c47919f3114ab2279c88b7a2