SDFGI: fix crash if update_data is nullptr

servers/rendering/renderer_rd/environment/gi.cpp

@@ -1790,6 +1790,10 @@ void GI::SDFGI::debug_probes(RID p_framebuffer, const uint32_t p_view_count, con
 }
 
 void GI::SDFGI::pre_process_gi(const Transform3D &p_transform, RenderDataRD *p_render_data) {
+	if (p_render_data->sdfgi_update_data == nullptr) {
+		return;
+	}
+
 	RendererRD::LightStorage *light_storage = RendererRD::LightStorage::get_singleton();
 	/* Update general SDFGI Buffer */
 

servers/rendering/renderer_rd/forward_clustered/render_forward_clustered.cpp

@@ -1126,6 +1126,10 @@ void RenderForwardClustered::_setup_lightmaps(const RenderDataRD *p_render_data,
 /* SDFGI */
 
 void RenderForwardClustered::_update_sdfgi(RenderDataRD *p_render_data) {
+	if (p_render_data->sdfgi_update_data == nullptr) {
+		return;
+	}
+
 	Ref<RenderSceneBuffersRD> rb;
 	if (p_render_data && p_render_data->render_buffers.is_valid()) {
 		rb = p_render_data->render_buffers;