protected function checkIfSingleFePageOrEmpty(
        $fieldName,
        $canUseFlexforms,
        $sheet,
        $explanation
    ) {
        $this->checkIfInteger($fieldName, $canUseFlexforms, $sheet, $explanation);
        $this->checkIfFePagesOrEmpty(
            $fieldName,
            $canUseFlexforms,
            $sheet,
            $explanation
        );
    }