Correction on BGE fixes:

- check that an object has been created before setting the physics environment
- check that there is an active camera before using it
- when a camera is deleted, remove it from m_cameras list

source/gameengine/Converter/BL_BlenderDataConversion.cpp

@@ -1670,7 +1670,8 @@ static KX_GameObject *gameobject_from_blenderobject(
 		break;
 	}
 	}
-	gameobj->SetPhysicsEnvironment(kxscene->GetPhysicsEnvironment());
+	if (gameobj)
+		gameobj->SetPhysicsEnvironment(kxscene->GetPhysicsEnvironment());
 	return gameobj;
 }
 

source/gameengine/Ketsji/KX_KetsjiEngine.cpp

@@ -617,7 +617,7 @@ void KX_KetsjiEngine::Render()
 		SetWorldSettings(scene->GetWorldInfo());
 
 		// Avoid drawing the scene with the active camera twice when it's viewport is enabled
-		if(!cam->GetViewport())
+		if(cam && !cam->GetViewport())
 		{
 			if (scene->IsClearingZBuffer())
 				m_rasterizer->ClearDepthBuffer();
@@ -854,6 +854,9 @@ void KX_KetsjiEngine::SetupRenderFrame(KX_Scene *scene, KX_Camera* cam)
 
 	RAS_Rect viewport;
 
+	if (!cam)
+		return;
+
 	if (cam->GetViewport()) {
 		viewport.SetLeft(cam->GetViewportLeft()); 
 		viewport.SetBottom(cam->GetViewportBottom());

source/gameengine/Ketsji/KX_Scene.cpp

@@ -794,6 +794,9 @@ int KX_Scene::NewRemoveObject(class CValue* gameobj)
 		//m_active_camera->Release();
 		m_active_camera = NULL;
 	}
+	// in case this is a camera
+	m_cameras.remove((KX_Camera*)newobj);
+
 	if (m_sceneConverter)
 		m_sceneConverter->UnregisterGameObject(newobj);
 	// return value will be 0 if the object is actually deleted (all reference gone)
@@ -942,6 +945,7 @@ void KX_Scene::AddCamera(KX_Camera* cam)
 		m_cameras.push_back(cam);
 }
 
+
 KX_Camera* KX_Scene::GetActiveCamera()
 {	
 	// NULL if not defined