Removing Text Fields

I’d really like to remove the text fields, as we have built out custom templates. But the plugin crashes when they are blank. I tried a work around editing the php – but it didn’t work – really hope you can help!

//Manage voucher title. If Voucher title is "voucher" the title is not visible on voucher. (by polecat)
		if($voucher->name == "voucher") {
			$vouchername = " ";
		} else
		{
			$vouchername = $voucher->name;
		}
		//This code $voucher->name must be replace into stripslashes function to set the original code (by polecat)
		// print title
		$pdf->writeHTML( stripslashes( $vouchername ), $ln=true, $fill=false, $reseth=false, $cell=false, $align='C');

		//Manage voucher text. If Voucher text is "hide" the text is not printed on voucher. (by polecat)
		if($voucher->text == "hide") {
			$vouchertext = "";
		} else
		{
			$vouchertext = $voucher->text;
		}
		// print text
		$pdf->Write( 5,  stripslashes( $vouchertext ), $link = '', $fill = 0, $align = 'C', $ln = true);		

		//Manage voucher terms. If Voucher text is "hide" the text is not printed on voucher. (by polecat)
		if($voucher->terms == "hide") {
			$vouchertext = "";
		} else
		{
			$vouchertext = $voucher->terms;
		}
		// print text
		$pdf->Write( 5,  stripslashes( $vouchertext ), $link = '', $fill = 0, $align = 'C', $ln = true);

https://wordpress.org/plugins/voucherpress/