yii\base\ErrorException: Undefined variable $start in /var/www/tracktraf.online/frontend/controllers/TelegramController.php:197

Stack trace:

#0 /var/www/tracktraf.online/frontend/controllers/TelegramController.php(197): yii\base\ErrorHandler->handleError()

#1 [internal function]: frontend\controllers\TelegramController->actionRotatorCheck()

#2 /var/www/tracktraf.online/vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array()

#3 /var/www/tracktraf.online/vendor/yiisoft/yii2/base/Controller.php(178): yii\base\InlineAction->runWithParams()

#4 /var/www/tracktraf.online/vendor/yiisoft/yii2/base/Module.php(552): yii\base\Controller->runAction()

#5 /var/www/tracktraf.online/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction()

#6 /var/www/tracktraf.online/vendor/yiisoft/yii2/base/Application.php(384): yii\web\Application->handleRequest()

#7 /var/www/tracktraf.online/frontend/web/index.php(18): yii\base\Application->run()

#8 {main}