Stale $GLOBALS[‘post’] after custom WP_Query empty result set bothers my template, whose fault is this?

Stale $GLOBALS[‘post’] after custom WP_Query empty result set bothers my template, whose fault is this?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)