diff --git a/src/PhpSpreadsheet/Calculation/ArrayEnabled.php b/src/PhpSpreadsheet/Calculation/ArrayEnabled.php
index 0ad429ed..1e3f6971 100644
--- a/src/PhpSpreadsheet/Calculation/ArrayEnabled.php
+++ b/src/PhpSpreadsheet/Calculation/ArrayEnabled.php
@@ -20,7 +20,7 @@ trait ArrayEnabled
         if (self::$arrayArgumentHelper === null) {
             self::$arrayArgumentHelper = new ArrayArgumentHelper();
         }
-        self::$arrayArgumentHelper->initialise($arguments ?: []);
+        self::$arrayArgumentHelper->initialise(($arguments === false) ? [] : $arguments);
     }
 
     /**
diff --git a/src/PhpSpreadsheet/Helper/Html.php b/src/PhpSpreadsheet/Helper/Html.php
index 4737379a..ce5a3d1d 100644
--- a/src/PhpSpreadsheet/Helper/Html.php
+++ b/src/PhpSpreadsheet/Helper/Html.php
@@ -795,7 +795,7 @@ class Html
         $domText = preg_replace(
             '/\s+/u',
             ' ',
-            str_replace(["\r", "\n"], ' ', $textNode->nodeValue ?: '')
+            str_replace(["\r", "\n"], ' ', $textNode->nodeValue ?? '')
         );
         $this->stringData .= $domText;
         $this->buildTextRun();
diff --git a/src/PhpSpreadsheet/Reader/Html.php b/src/PhpSpreadsheet/Reader/Html.php
index 15c9f625..437d931d 100644
--- a/src/PhpSpreadsheet/Reader/Html.php
+++ b/src/PhpSpreadsheet/Reader/Html.php
@@ -619,7 +619,7 @@ class Html extends BaseReader
     {
         foreach ($element->childNodes as $child) {
             if ($child instanceof DOMText) {
-                $domText = preg_replace('/\s+/u', ' ', trim($child->nodeValue ?: ''));
+                $domText = preg_replace('/\s+/u', ' ', trim($child->nodeValue ?? ''));
                 if (is_string($cellContent)) {
                     //    simply append the text if the cell content is a plain text string
                     $cellContent .= $domText;
diff --git a/src/PhpSpreadsheet/Reader/Ods.php b/src/PhpSpreadsheet/Reader/Ods.php
index fcafc047..27c58edb 100644
--- a/src/PhpSpreadsheet/Reader/Ods.php
+++ b/src/PhpSpreadsheet/Reader/Ods.php
@@ -325,7 +325,7 @@ class Ods extends BaseReader
                 }
                 $spreadsheet->setActiveSheetIndex($worksheetID);
 
-                if ($worksheetName) {
+                if ($worksheetName || is_numeric($worksheetName)) {
                     // Use false for $updateFormulaCellReferences to prevent adjustment of worksheet references in
                     // formula cells... during the load, all formulae should be correct, and we're simply
                     // bringing the worksheet name in line with the formula, not the reverse
@@ -628,7 +628,7 @@ class Ods extends BaseReader
         foreach ($settings->getElementsByTagNameNS($configNs, 'config-item') as $t) {
             if ($t->getAttributeNs($configNs, 'name') === 'ActiveTable') {
                 try {
-                    $spreadsheet->setActiveSheetIndexByName($t->nodeValue ?: '');
+                    $spreadsheet->setActiveSheetIndexByName($t->nodeValue ?? '');
                 } catch (Throwable $e) {
                     // do nothing
                 }
diff --git a/tests/PhpSpreadsheetTests/Helper/HtmlTest.php b/tests/PhpSpreadsheetTests/Helper/HtmlTest.php
index b2fadf42..3315771a 100644
--- a/tests/PhpSpreadsheetTests/Helper/HtmlTest.php
+++ b/tests/PhpSpreadsheetTests/Helper/HtmlTest.php
@@ -28,6 +28,7 @@ class HtmlTest extends TestCase
             ['können', 'können'],
             ['русский', 'русский'],
             ["foo\nbar", '<p>foo</p><p>bar</p>'],
+            'issue2810' => ['0', '0'],
         ];
     }
 }
diff --git a/tests/PhpSpreadsheetTests/Reader/Html/Issue2810Test.php b/tests/PhpSpreadsheetTests/Reader/Html/Issue2810Test.php
new file mode 100644
index 00000000..40ced6ed
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Html/Issue2810Test.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Html;
+
+use PhpOffice\PhpSpreadsheet\Reader\Html;
+use PHPUnit\Framework\TestCase;
+
+class Issue2810Test extends TestCase
+{
+    // Reader has been converting falsey values to null
+    public function testIssue2810(): void
+    {
+        $content = <<<'EOF'
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset='utf-8'>
+    <title>Declaracion en Linea</title>
+</head>
+<body>
+  <table>
+    <tr>
+      <td>1</td>
+      <td>0</td>
+      <td>2</td>
+    </tr>
+  </table>
+</body>
+</html>
+
+EOF;
+        $reader = new Html();
+        $spreadsheet = $reader->loadFromString($content);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame(1, $sheet->getCell('A1')->getValue());
+        self::assertSame(0, $sheet->getCell('B1')->getValue());
+        self::assertSame(2, $sheet->getCell('C1')->getValue());
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Reader/Ods/Issue2810Test.php b/tests/PhpSpreadsheetTests/Reader/Ods/Issue2810Test.php
new file mode 100644
index 00000000..bbb697b8
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Reader/Ods/Issue2810Test.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader\Ods;
+
+use PhpOffice\PhpSpreadsheet\Reader\Ods;
+use PHPUnit\Framework\TestCase;
+
+class Issue2810Test extends TestCase
+{
+    public function testIssue2810(): void
+    {
+        // Active sheet with title of '0' wasn't found
+        $filename = 'tests/data/Reader/Ods/issue.2810.ods';
+        $reader = new Ods();
+        $spreadsheet = $reader->load($filename);
+        $sheet = $spreadsheet->getActiveSheet();
+        self::assertSame('Active', $sheet->getCell('A1')->getValue());
+        $spreadsheet->disconnectWorksheets();
+    }
+}
diff --git a/tests/data/Reader/Ods/issue.2810.ods b/tests/data/Reader/Ods/issue.2810.ods
new file mode 100644
index 00000000..ba8d581f
Binary files /dev/null and b/tests/data/Reader/Ods/issue.2810.ods differ