=== modified file 'src/scene-refract.cpp'
--- src/scene-refract.cpp	2013-06-12 17:54:21 +0000
+++ src/scene-refract.cpp	2014-07-22 17:21:19 +0000
@@ -144,8 +144,10 @@
 SceneRefract::teardown()
 {
     // Add scene-specific teardown here
-    priv_->teardown();
-    delete priv_;
+    if (priv_) {
+        priv_->teardown();
+        delete priv_;
+    }
     Scene::teardown();
 }
 

=== modified file 'src/scene-shadow.cpp'
--- src/scene-shadow.cpp	2013-06-12 17:54:21 +0000
+++ src/scene-shadow.cpp	2014-07-22 17:21:55 +0000
@@ -534,8 +534,10 @@
 SceneShadow::teardown()
 {
     // Add scene-specific teardown here
-    priv_->teardown();
-    delete priv_;
+    if (priv_) {
+        priv_->teardown();
+        delete priv_;
+    }
     Scene::teardown();
 }