Index: wp-admin/includes/schema.php
===================================================================
--- wp-admin/includes/schema.php	(revision 17450)
+++ wp-admin/includes/schema.php	(working copy)
@@ -737,7 +737,7 @@
 	$current_site->site_name = ucfirst( $domain );
 
 	if ( !is_multisite() ) {
-		$wpdb->insert( $wpdb->blogs, array( 'site_id' => $network_id, 'domain' => $domain, 'path' => $path, 'registered' => current_time( 'mysql' ) ) );
+		$wpdb->insert( $wpdb->blogs, array( 'site_id' => $network_id, 'blog_id' => 1, 'domain' => $domain, 'path' => $path, 'registered' => current_time( 'mysql' ) ) );
 		$blog_id = $wpdb->insert_id;
 		update_user_meta( $site_user->ID, 'source_domain', $domain );
 		update_user_meta( $site_user->ID, 'primary_blog', $blog_id );