From b5f0bf47ac4db286b682830fd8dcf31415ff016e Mon Sep 17 00:00:00 2001
From: Dion Hulse <dd32@git.wordpress.org>
Date: Fri, 24 Sep 2010 12:09:44 +0000
Subject: [PATCH] Do not generate invalid SQL for empty term archives. See
 #12891

git-svn-id: https://develop.svn.wordpress.org/trunk@15652 602fd350-edb4-49c9-b593-d223f7449a82
---
 wp-includes/query.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/wp-includes/query.php b/wp-includes/query.php
index a4f6a0dd50..3a3014df8b 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -1921,7 +1921,11 @@ class WP_Query {
 				$post_status_join = true;
 			}
 
-			$where .= " AND $wpdb->posts.ID IN( " . implode( ', ', wp_tax_query( $tax_query ) ) . ")";
+			$ids = wp_tax_query( $tax_query );
+			if ( !empty($ids) )
+				$where .= " AND $wpdb->posts.ID IN(" . implode( ', ', $ids ) . ")";
+			else
+				$where .= ' AND 0 = 1';
 		}
 
 		if ( !empty($q['meta_key']) ) {