From 6adcd154358a16f876c2d386d86af655c752c141 Mon Sep 17 00:00:00 2001
From: Boone Gorges <boonebgorges@git.wordpress.org>
Date: Fri, 9 Sep 2016 19:36:22 +0000
Subject: [PATCH] Query: Avoid PHP notice in `get_queried_object()` when query
 contains `NOT EXISTS` tax query.

Props johnjamesjacoby.
See #37962.

git-svn-id: https://develop.svn.wordpress.org/trunk@38585 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/class-wp-query.php |  2 +-
 tests/phpunit/tests/query.php      | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/wp-includes/class-wp-query.php b/src/wp-includes/class-wp-query.php
index 95904060ce..fd7dfe08db 100644
--- a/src/wp-includes/class-wp-query.php
+++ b/src/wp-includes/class-wp-query.php
@@ -3264,7 +3264,7 @@ class WP_Query {
 					$matched_taxonomy = reset( $queried_taxonomies );
 					$query = $tax_query_in_and[ $matched_taxonomy ];
 
-					if ( $query['terms'] ) {
+					if ( ! empty( $query['terms'] ) ) {
 						if ( 'term_id' == $query['field'] ) {
 							$term = get_term( reset( $query['terms'] ), $matched_taxonomy );
 						} else {
diff --git a/tests/phpunit/tests/query.php b/tests/phpunit/tests/query.php
index 48086b0bfe..04e6d092f2 100644
--- a/tests/phpunit/tests/query.php
+++ b/tests/phpunit/tests/query.php
@@ -118,6 +118,25 @@ class Tests_Query extends WP_UnitTestCase {
 		unset( $q->query_vars['wptests_tax'] );
 	}
 
+	/**
+	 * @ticket 37962
+	 */
+	public function test_get_queried_object_should_return_null_for_not_exists_tax_query() {
+		register_taxonomy( 'wptests_tax', 'post' );
+
+		$q = new WP_Query( array(
+			'tax_query' => array(
+				array(
+					'taxonomy' => 'wptests_tax',
+					'operator' => 'NOT EXISTS',
+				),
+			),
+		) );
+
+		$queried_object = $q->get_queried_object();
+		$this->assertNull( $queried_object );
+	}
+
 	public function test_orderby_space_separated() {
 		global $wpdb;