fixed

Closes #3383492

lib/Cleantalk/Common/Cron/Cron.php

@@ -249,13 +249,8 @@ class Cron
                 $task_data['params'] = array();
             }
 
-            if (
-                !isset(
-                    $task_data['handler'],
-                    $task_data['next_call'],
-                    $task_data['period']
-                )
-            ) {
+            $required_keys = ['handler', 'next_call', 'period'];
+             {
                 if ($this->debug) {
                     error_log(var_export('Task data format is incorrect ' . $task_name, true));
                 }