diff --git a/wp-includes/class-wp-site-query.php b/wp-includes/class-wp-site-query.php
index b19b8f205e..cedc9c5e2e 100644
--- a/wp-includes/class-wp-site-query.php
+++ b/wp-includes/class-wp-site-query.php
@@ -514,6 +514,8 @@ class WP_Site_Query {
 			$this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this->date_query->get_sql() );
 		}
 
+		$join = '';
+
 		$where = implode( ' AND ', $this->sql_clauses['where'] );
 
 		$pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c229e446a0..592e879b0b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38630';
+$wp_version = '4.7-alpha-38631';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.