SearchPerformance add condition for exists sql array

core/components/SearchPerformance.php

@@ -8,12 +8,14 @@ namespace core\components;
 
 use Yii;
 
-class SearchPerformance {
+class SearchPerformance
+{
     public static function init()
     {
+        if (isset(Yii::$app->params['search_rules']) && is_array(Yii::$app->params['search_rules'])) {
             $connection = Yii::$app->getDb();
-		$command = $connection->createCommand("
-		CREATE OR REPLACE VIEW view_search AS " . implode(' UNION ', Yii::$app->params['search_rules']));
+            $command    = $connection->createCommand('CREATE OR REPLACE VIEW view_search AS ' . implode(' UNION ', Yii::$app->params['search_rules']));
             $command->execute();
         }
     }
+}