Fixed error when no SQL queries logged by core.

CHANGELOG.md

@@ -18,6 +18,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Deprecated
 - old format of hook events
 
+### Fixed
+- error when no SQL queries logged by core
+
 ## 2.0 - 2018-02-26
 
 ### Added

src/Record/Sql_Record_Collector.php

@@ -56,12 +56,12 @@ class Sql_Record_Collector implements Record_Collector_Interface {
 	 */
 	public function get_records(): array {
 
-		if ( ! $this->is_savequeries() ) {
+		global $wpdb;
+
+		if ( empty( $wpdb->queries ) ) {
 			return [];
 		}
 
-		global $wpdb;
-
 		/** @var array $wpdb->queries */
 		return array_map( [ $this, 'transform' ], array_keys( $wpdb->queries ), $wpdb->queries );
 	}