From 647e79cfcc3ead3b6c95e01937a1a0d70bf34395 Mon Sep 17 00:00:00 2001
From: Pavel Rojtberg <pavel.rojtberg@igd.fraunhofer.de>
Date: Fri, 22 Nov 2019 12:15:57 +0100
Subject: [PATCH] ovis: addResourceLocation - assert pre-condition

---
 modules/ovis/src/ovis.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/ovis/src/ovis.cpp b/modules/ovis/src/ovis.cpp
index 664832028..7f824afa0 100644
--- a/modules/ovis/src/ovis.cpp
+++ b/modules/ovis/src/ovis.cpp
@@ -939,6 +939,7 @@ public:
 
 CV_EXPORTS_W void addResourceLocation(const String& path)
 {
+    CV_Assert(!_app && "must be called before the first createWindow");
     _extraResourceLocations.insert(Ogre::StringUtil::normalizeFilePath(path, false));
 }