From 45ecfbe3630a17cab3d70e078362517dadbc8ff4 Mon Sep 17 00:00:00 2001
From: Matthew Einhorn <moiein2000@gmail.com>
Date: Sun, 28 Apr 2013 13:44:11 -0400
Subject: [PATCH] Don't freeze when openning a modal view twice.

---
 kivy/uix/modalview.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kivy/uix/modalview.py b/kivy/uix/modalview.py
index fc5efb5bc..8e0ad91c8 100644
--- a/kivy/uix/modalview.py
+++ b/kivy/uix/modalview.py
@@ -166,6 +166,9 @@ class ModalView(AnchorLayout):
         window, the view will attach to the global
         :class:`~kivy.core.window.Window`.
         '''
+        if self._window is not None:
+            Logger.warning('ModalView: you can only open once.')
+            return self
         # search window
         self._window = self._search_window()
         if not self._window: