diff --git a/src/Invoice/Renderer/AbstractSpreadsheetRenderer.php b/src/Invoice/Renderer/AbstractSpreadsheetRenderer.php
index 7cb1e554..b6690d53 100644
--- a/src/Invoice/Renderer/AbstractSpreadsheetRenderer.php
+++ b/src/Invoice/Renderer/AbstractSpreadsheetRenderer.php
@@ -46,7 +46,13 @@ abstract class AbstractSpreadsheetRenderer extends AbstractRenderer
             $this->addTemplateRows($worksheet, $invoiceItemCount);
         }
 
-        $worksheet->setTitle($model->getTemplate()->getTitle());
+        // cleanup the title, PHP Office doesn't allow arbitrary strings
+        $title = substr($model->getTemplate()->getTitle(), 0, 31);
+        foreach (Worksheet::getInvalidCharacters() as $char) {
+            $title = str_replace($char, ' ', $title);
+        }
+
+        $worksheet->setTitle($title);
 
         $entryRow = 0;
 
diff --git a/src/Invoice/Renderer/RendererTrait.php b/src/Invoice/Renderer/RendererTrait.php
index 93a4af05..5e15a0c5 100644
--- a/src/Invoice/Renderer/RendererTrait.php
+++ b/src/Invoice/Renderer/RendererTrait.php
@@ -10,7 +10,6 @@
 namespace App\Invoice\Renderer;
 
 use App\Entity\InvoiceDocument;
-use App\Entity\UserPreference;
 use App\Invoice\InvoiceItem;
 use App\Invoice\InvoiceModel;
 use Symfony\Component\HttpFoundation\BinaryFileResponse;
@@ -57,7 +56,7 @@ trait RendererTrait
 
     /**
      * @param int $amount
-     * @param string $currency
+     * @param string|null $currency
      * @return mixed
      */
     abstract protected function getFormattedMoney($amount, $currency);
@@ -90,18 +89,24 @@ trait RendererTrait
         $project = $model->getQuery()->getProject();
         $activity = $model->getQuery()->getActivity();
         $currency = $model->getCalculator()->getCurrency();
+        $tax = $model->getCalculator()->getTax();
+        $total = $model->getCalculator()->getTotal();
+        $subtotal = $model->getCalculator()->getSubtotal();
 
         $values = [
             'invoice.due_date' => $this->getFormattedDateTime($model->getDueDate()),
             'invoice.date' => $this->getFormattedDateTime($model->getInvoiceDate()),
             'invoice.number' => $model->getNumberGenerator()->getInvoiceNumber(),
-            'invoice.currency' => $model->getCalculator()->getCurrency(),
+            'invoice.currency' => $currency,
             'invoice.vat' => $model->getCalculator()->getVat(),
-            'invoice.tax' => $this->getFormattedMoney($model->getCalculator()->getTax(), $currency),
+            'invoice.tax' => $this->getFormattedMoney($tax, $currency),
+            'invoice.tax_nc' => $this->getFormattedMoney($tax, null),
             'invoice.total_time' => $this->getFormattedDuration($model->getCalculator()->getTimeWorked()),
             'invoice.duration_decimal' => $this->getFormattedDecimalDuration($model->getCalculator()->getTimeWorked()),
-            'invoice.total' => $this->getFormattedMoney($model->getCalculator()->getTotal(), $currency),
-            'invoice.subtotal' => $this->getFormattedMoney($model->getCalculator()->getSubtotal(), $currency),
+            'invoice.total' => $this->getFormattedMoney($total, $currency),
+            'invoice.total_nc' => $this->getFormattedMoney($total, null),
+            'invoice.subtotal' => $this->getFormattedMoney($subtotal, $currency),
+            'invoice.subtotal_nc' => $this->getFormattedMoney($subtotal, null),
 
             'template.name' => $model->getTemplate()->getName(),
             'template.company' => $model->getTemplate()->getCompany(),
@@ -205,8 +210,9 @@ trait RendererTrait
 
         $user = $invoiceItem->getUser();
 
+        // this should never happen!
         if (empty($hourlyRate)) {
-            $hourlyRate = $user->getPreferenceValue(UserPreference::HOURLY_RATE);
+            $hourlyRate = 0;
         }
 
         $activity = $invoiceItem->getActivity();
@@ -222,7 +228,9 @@ trait RendererTrait
             'entry.description' => $description,
             'entry.amount' => $amount,
             'entry.rate' => $this->getFormattedMoney($hourlyRate, $currency),
+            'entry.rate_nc' => $this->getFormattedMoney($hourlyRate, null),
             'entry.total' => $this->getFormattedMoney($rate, $currency),
+            'entry.total_nc' => $this->getFormattedMoney($rate, null),
             'entry.currency' => $currency,
             'entry.duration' => $invoiceItem->getDuration(),
             'entry.duration_decimal' => $this->getFormattedDecimalDuration($invoiceItem->getDuration()),
diff --git a/tests/Invoice/Renderer/DebugRendererTest.php b/tests/Invoice/Renderer/DebugRendererTest.php
index ca0a9f9f..e6f61609 100644
--- a/tests/Invoice/Renderer/DebugRendererTest.php
+++ b/tests/Invoice/Renderer/DebugRendererTest.php
@@ -60,10 +60,13 @@ class DebugRendererTest extends TestCase
             'invoice.currency',
             'invoice.vat',
             'invoice.tax',
+            'invoice.tax_nc',
             'invoice.total_time',
             'invoice.duration_decimal',
             'invoice.total',
+            'invoice.total_nc',
             'invoice.subtotal',
+            'invoice.subtotal_nc',
             'template.name',
             'template.company',
             'template.address',
@@ -123,7 +126,9 @@ class DebugRendererTest extends TestCase
             'entry.description',
             'entry.amount',
             'entry.rate',
+            'entry.rate_nc',
             'entry.total',
+            'entry.total_nc',
             'entry.currency',
             'entry.duration',
             'entry.duration_decimal',
diff --git a/tests/Invoice/Renderer/RendererTestTrait.php b/tests/Invoice/Renderer/RendererTestTrait.php
index 4c3f4876..ae7059a9 100644
--- a/tests/Invoice/Renderer/RendererTestTrait.php
+++ b/tests/Invoice/Renderer/RendererTestTrait.php
@@ -89,7 +89,7 @@ trait RendererTestTrait
         $customer->setMetaField((new CustomerMeta())->setName('foo-customer')->setValue('bar-customer')->setIsVisible(true));
 
         $template = new InvoiceTemplate();
-        $template->setTitle('a test invoice template title');
+        $template->setTitle('a very *long* test invoice / template title with [special] character');
         $template->setVat(19);
 
         $project = new Project();
diff --git a/tests/Invoice/Renderer/TwigRendererTest.php b/tests/Invoice/Renderer/TwigRendererTest.php
index 46a3c825..7b621845 100644
--- a/tests/Invoice/Renderer/TwigRendererTest.php
+++ b/tests/Invoice/Renderer/TwigRendererTest.php
@@ -63,7 +63,7 @@ class TwigRendererTest extends KernelTestCase
         $content = $response->getContent();
 
         $this->assertStringContainsString('<h2 class="page-header">
-           <span contenteditable="true">a test invoice template title</span>
+           <span contenteditable="true">a very *long* test invoice / template title with [special] character</span>
         </h2>', $content);
         $this->assertEquals(5, substr_count($content, 'activity description'));
     }