diff --git a/openVulkanoCpp/Scene/Prefabs/ArBackgroundDrawable.cpp b/openVulkanoCpp/Scene/Prefabs/ArBackgroundDrawable.cpp
index 6268abc..7772469 100644
--- a/openVulkanoCpp/Scene/Prefabs/ArBackgroundDrawable.cpp
+++ b/openVulkanoCpp/Scene/Prefabs/ArBackgroundDrawable.cpp
@@ -46,7 +46,8 @@ namespace OpenVulkano::Scene
 
 	void ArBackgroundDrawable::Close()
 	{
-		m_arSession->OnNewFrame -= EventHandler(this, &ArBackgroundDrawable::OnNewArFrame);
+		if (m_arSession) m_arSession->OnNewFrame -= EventHandler(this, &ArBackgroundDrawable::OnNewArFrame);
+		m_arSession = nullptr;
 		m_nextFrame = nullptr;
 		Drawable::Close();
 	}
@@ -70,4 +71,4 @@ namespace OpenVulkano::Scene
 		}
 		if (!m_texture) m_texture = &Texture::PLACEHOLDER;
 	}
-}
\ No newline at end of file
+}