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Error

Call to a member function getPublications() on null

$_GET = [
    'lang' => 'pt',
    'category' => 'clara-sofia-gouveia',
    'idCategory' => '81',
    'idParentCategory' => '23',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => [
        'customer/dashboard',
    ],
];

Fatal error: Uncaught yii\web\HeadersAlreadySentException: Headers already sent in /var/www/smart_grids/vendor/yiisoft/yii2/web/Response.php on line 428. in /var/www/smart_grids/vendor/yiisoft/yii2/web/Response.php:366 Stack trace: #0 /var/www/smart_grids/vendor/yiisoft/yii2/web/Response.php(339): yii\web\Response->sendHeaders() #1 /var/www/smart_grids/vendor/yiisoft/yii2/web/ErrorHandler.php(136): yii\web\Response->send() #2 /var/www/smart_grids/vendor/yiisoft/yii2/base/ErrorHandler.php(276): yii\web\ErrorHandler->renderException(Object(yii\base\ErrorException)) #3 [internal function]: yii\base\ErrorHandler->handleFatalError() #4 {main} thrown in /var/www/smart_grids/vendor/yiisoft/yii2/web/Response.php on line 366