Another quick-fix for background mode

source/blender/windowmanager/intern/wm_init_exit.c

@@ -228,7 +228,10 @@ void WM_exit(bContext *C)
 	
 	fastshade_free_render();	/* shaded view */
 	ED_preview_free_dbase();	/* frees a Main dbase, before free_blender! */
-	wm_free_reports(C);			/* before free_blender! - since the ListBases get freed there */
+
+	if(C && CTX_wm_manager(C))
+		wm_free_reports(C);			/* before free_blender! - since the ListBases get freed there */
+		
 	free_blender();				/* blender.c, does entire library and spacetypes */
 //	free_matcopybuf();
 	free_anim_copybuf();