Fix #33114: crash with render frame update script and GLSL.

source/blender/editors/render/render_update.c

@@ -378,6 +378,12 @@ static void scene_changed(Main *bmain, Scene *UNUSED(scene))
 
 void ED_render_id_flush_update(Main *bmain, ID *id)
 {
+	/* this can be called from render or baking thread when a python script makes
+	 * changes, in that case we don't want to do any editor updates, and making
+	 * GPU changes is not possible because OpenGL only works in the main thread */
+	if (!BLI_thread_is_main())
+		return;
+
 	switch (GS(id->name)) {
 		case ID_MA:
 			material_changed(bmain, (Material *)id);