public function termsValidator( $attribute, $params ) {

		if( $this->terms === 'on' ) {

			return;
		}

		if( !isset( $this->terms ) || $this->terms <= 0 ) {

			$this->addError( $attribute, Yii::$app->coreMessage->getMessage( CoreGlobal::ERROR_TERMS ) );
		}
	}