Daya

In English :
You can correct this error 😉 Edit the file query.php on directory wp-includes of WordPress :
replace :

if ( isset($q['post_status']) && $q['post_status'] != '' ) {
			$statuswheres = array();
			$q_status = explode(',', $q['post_status']);

by it :

if ( ! empty( $q['post_status'] ) ) {
			$statuswheres = array();
			$q_status = $q['post_status'];
			if ( ! is_array( $q_status ) )
				$q_status = explode(',', $q_status);

In French / en Français :
Vous pouvez corriger cette erreur 😉 Editez le fichier query.php dans le dossier wp-includes de WordPress :
remplacez :

if ( isset($q['post_status']) && $q['post_status'] != '' ) {
			$statuswheres = array();
			$q_status = explode(',', $q['post_status']);

par ça :

if ( ! empty( $q['post_status'] ) ) {
			$statuswheres = array();
			$q_status = $q['post_status'];
			if ( ! is_array( $q_status ) )
				$q_status = explode(',', $q_status);

Enjoy xD