diff --git a/Admin/Installer.php b/Admin/Installer.php
index 0a7faea..7ced5b7 100755
--- a/Admin/Installer.php
+++ b/Admin/Installer.php
@@ -141,9 +141,9 @@ final class Installer extends InstallerAbstract
                 continue;
             }
 
-            $billAttrType[$attribute['name']] = !\is_array($responseData['response'])
-                ? $responseData['response']->toArray()
-                : $responseData['response'];
+            $billAttrType[$attribute['name']] = \is_array($responseData['response'])
+                ? $responseData['response']
+                : $responseData['response']->toArray();
 
             $isFirst = true;
             foreach ($attribute['l11n'] as $language => $l11n) {
@@ -212,9 +212,9 @@ final class Installer extends InstallerAbstract
                     continue;
                 }
 
-                $attrValue = !\is_array($responseData['response'])
-                    ? $responseData['response']->toArray()
-                    : $responseData['response'];
+                $attrValue = \is_array($responseData['response'])
+                    ? $responseData['response']
+                    : $responseData['response']->toArray();
 
                 $billAttrValue[$attribute['name']][] = $attrValue;
 
@@ -298,9 +298,9 @@ final class Installer extends InstallerAbstract
                 continue;
             }
 
-            $result = !\is_array($responseData['response'])
-                ? $responseData['response']->toArray()
-                : $responseData['response'];
+            $result = \is_array($responseData['response'])
+                ? $responseData['response']
+                : $responseData['response']->toArray();
 
             $results[] = $result;
         }
@@ -350,9 +350,9 @@ final class Installer extends InstallerAbstract
                 continue;
             }
 
-            $billType = !\is_array($responseData['response'])
-                ? $responseData['response']->toArray()
-                : $responseData['response'];
+            $billType = \is_array($responseData['response'])
+                ? $responseData['response']
+                : $responseData['response']->toArray();
 
             $billTypes[] = $billType;
 
diff --git a/Controller/ApiBillController.php b/Controller/ApiBillController.php
index 39ddce1..4078921 100755
--- a/Controller/ApiBillController.php
+++ b/Controller/ApiBillController.php
@@ -321,14 +321,12 @@ final class ApiBillController extends Controller
         $taxCode = $this->app->moduleManager->get('Billing', 'ApiTax')
             ->getTaxCodeFromClientItem($client, $item, $request->header->l11n->country);
 
-        $element = BillElement::fromItem(
+        return BillElement::fromItem(
             $item,
             $taxCode,
             $request->getDataInt('quantity') ?? 1,
             $bill->id
         );
-
-        return $element;
     }
 
     /**
diff --git a/Theme/Backend/bill-create.tpl.php b/Theme/Backend/bill-create.tpl.php
index c575002..d8e30bc 100755
--- a/Theme/Backend/bill-create.tpl.php
+++ b/Theme/Backend/bill-create.tpl.php
@@ -42,7 +42,7 @@ $archive = $bill->getFileByTypeName('original');
 $logs = $this->data['logs'] ?? [];
 
 $editable = $bill->id === 0 || \in_array($bill->getStatus(), [BillStatus::DRAFT, BillStatus::UNPARSED]);
-$disabled = !$editable  ? ' disabled' : '';
+$disabled = $editable  ? '' : ' disabled';
 
 echo $this->data['nav']->render(); ?>
 
diff --git a/Theme/Backend/user-purchase-bill-dashboard.tpl.php b/Theme/Backend/user-purchase-bill-dashboard.tpl.php
index 2bb596b..c66623b 100755
--- a/Theme/Backend/user-purchase-bill-dashboard.tpl.php
+++ b/Theme/Backend/user-purchase-bill-dashboard.tpl.php
@@ -171,11 +171,11 @@ echo $this->data['nav']->render(); ?>
                          ?>"><?= $value->billAddress; ?></a>
                         <td><a href="<?= $url; ?>"><?= $value->billZip; ?></a>
                         <td><a href="<?= $url; ?>"><?= $value->billCity; ?></a>
-                        <td><a href="<?= $url; ?>"><?= !empty($value->billCountry)
-                            ? ISO3166NameEnum::getByName(
+                        <td><a href="<?= $url; ?>"><?= empty($value->billCountry)
+                            ? ''
+                            : ISO3166NameEnum::getByName(
                                     ISO3166TwoEnum::getName($value->billCountry)
-                                )
-                            : ''; ?></a>
+                                ); ?></a>
                         <td><a href="<?= $url; ?>"><?= $value->grossCosts->getAmount(); ?></a>
                         <td><a href="<?= $url; ?>"><?= $value->billDate?->format('Y-m-d'); ?></a>
                 <?php endforeach; ?>
diff --git a/tests/Bootstrap.php b/tests/Bootstrap.php
index b904f0c..44438e2 100755
--- a/tests/Bootstrap.php
+++ b/tests/Bootstrap.php
@@ -381,7 +381,7 @@ function phpServe() : void
 
     // Execute the command and store the process ID
     $output = [];
-    echo \sprintf('Starting server...') . \PHP_EOL;
+    echo 'Starting server...' . \PHP_EOL;
     echo \sprintf(' Current directory: %s', \getcwd()) . \PHP_EOL;
     echo \sprintf(' %s', $command);
     \exec($command, $output);
@@ -406,7 +406,7 @@ function phpServe() : void
 
     // Kill the web server when the process ends
     \register_shutdown_function(function() use ($killCommand, $pid) : void {
-        echo \PHP_EOL . \sprintf('Stopping server...') . \PHP_EOL;
+        echo \PHP_EOL . 'Stopping server...' . \PHP_EOL;
         echo \sprintf(' %s - Killing process with ID %d', \date('r'), $pid) . \PHP_EOL;
         \exec($killCommand . $pid);
     });