diff --git a/compare.php b/compare.php
index 64ae1b0..0f5a72d 100644
--- a/compare.php
+++ b/compare.php
@@ -119,7 +119,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['remove_compare'])) {
                         </tr>
                         <?php foreach ($attributes as $attrId => $attr): ?>
                             <tr>
-                                <td style="padding: 10px; border: 1px solid #334155; font-weight: bold; background: #0f172a;"><?= htmlspecialchars($attr['name']) ?></td>
+                                <td style="padding: 10px; border: 1px solid #334155; font-weight: bold; background: #0f172a;"><?= htmlspecialchars($attr['name'] ?? '') ?></td>
                                 <?php foreach ($productIds as $pId): ?>
                                     <?php if (!isset($products[$pId])) continue; ?>
                                     <td style="padding: 10px; border: 1px solid #334155; text-align: center; background: <?= $pId % 2 == 0 ? '#1e293b' : '#0f172a' ?>;">
@@ -127,9 +127,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['remove_compare'])) {
                                         if (isset($productAttrVals[$pId][$attrId])) {
                                             $valRow = $productAttrVals[$pId][$attrId];
                                             if (!empty($valRow['valueString'])) {
-                                                echo htmlspecialchars($valRow['valueString']);
+                                                echo htmlspecialchars($valRow['valueString'] ?? '');
                                             } elseif (!empty($valRow['valueNumber']) || $valRow['valueNumber'] === '0.00' || $valRow['valueNumber'] === 0) {
-                                                echo htmlspecialchars(floatval($valRow['valueNumber'])) . " " . htmlspecialchars($attr['unit']);
+                                                echo htmlspecialchars((string)floatval($valRow['valueNumber'])) . " " . htmlspecialchars($attr['unit'] ?? '');
                                             } elseif ($valRow['valueBool'] !== null) {
                                                 echo $valRow['valueBool'] ? 'Ja' : 'Nein';
                                             } else {