diff --git a/libraries/classes/Console.php b/libraries/classes/Console.php
index c416355939..38492f090d 100644
--- a/libraries/classes/Console.php
+++ b/libraries/classes/Console.php
@@ -31,7 +31,7 @@ class Console
      *
      * @var bool
      */
-    private $isAjax;
+    private $isAjax = false;
 
     /** @var Relation */
     private $relation;
diff --git a/libraries/classes/Footer.php b/libraries/classes/Footer.php
index 29c5d981f4..075644a39f 100644
--- a/libraries/classes/Footer.php
+++ b/libraries/classes/Footer.php
@@ -36,7 +36,7 @@ class Footer
      *
      * @var bool
      */
-    private $isAjax;
+    private $isAjax = false;
     /**
      * Whether to only close the BODY and HTML tags
      * or also include scripts, errors and links
diff --git a/libraries/classes/Header.php b/libraries/classes/Header.php
index 788db33931..d462d0031b 100644
--- a/libraries/classes/Header.php
+++ b/libraries/classes/Header.php
@@ -76,7 +76,7 @@ class Header
      *
      * @var bool
      */
-    private $isAjax;
+    private $isAjax = false;
     /**
      * Whether to display anything
      *
@@ -107,7 +107,6 @@ class Header
         $this->template = new Template();
 
         $this->isEnabled = true;
-        $this->isAjax = false;
         $this->bodyId = '';
         $this->title = '';
         $this->console = new Console();
diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index cbd0460f02..7b3e184bf6 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -995,11 +995,6 @@
       <code>$tabs</code>
     </PossiblyNullIterator>
   </file>
-  <file src="libraries/classes/Console.php">
-    <PropertyNotSetInConstructor occurrences="1">
-      <code>$isAjax</code>
-    </PropertyNotSetInConstructor>
-  </file>
   <file src="libraries/classes/Controllers/AbstractController.php">
     <MixedArgument occurrences="1">
       <code>$db</code>
@@ -6820,9 +6815,6 @@
       <code>array{revision: string, revisionUrl: string, branch: string, branchUrl: string}|[]</code>
       <code>is_array($info) ? $info : []</code>
     </MixedReturnTypeCoercion>
-    <PropertyNotSetInConstructor occurrences="1">
-      <code>$isAjax</code>
-    </PropertyNotSetInConstructor>
     <RedundantCast occurrences="3">
       <code>(string) $GLOBALS['db']</code>
       <code>(string) $GLOBALS['table']</code>
diff --git a/test/classes/ConsoleTest.php b/test/classes/ConsoleTest.php
index 23ebd5ec3a..7aeaecceea 100644
--- a/test/classes/ConsoleTest.php
+++ b/test/classes/ConsoleTest.php
@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace PhpMyAdmin\Tests;
 
 use PhpMyAdmin\Console;
+use ReflectionProperty;
 
 /**
  * @covers \PhpMyAdmin\Console
@@ -16,4 +17,17 @@ class ConsoleTest extends AbstractTestCase
         $console = new Console();
         $this->assertEquals(['console.js'], $console->getScripts());
     }
+
+    public function testSetAjax(): void
+    {
+        $isAjax = new ReflectionProperty(Console::class, 'isAjax');
+        $isAjax->setAccessible(true);
+        $console = new Console();
+
+        $this->assertFalse($isAjax->getValue($console));
+        $console->setAjax(true);
+        $this->assertTrue($isAjax->getValue($console));
+        $console->setAjax(false);
+        $this->assertFalse($isAjax->getValue($console));
+    }
 }
diff --git a/test/classes/FooterTest.php b/test/classes/FooterTest.php
index 679734704f..393a56b9c6 100644
--- a/test/classes/FooterTest.php
+++ b/test/classes/FooterTest.php
@@ -7,6 +7,7 @@ namespace PhpMyAdmin\Tests;
 use ArrayIterator;
 use PhpMyAdmin\ErrorHandler;
 use PhpMyAdmin\Footer;
+use ReflectionProperty;
 
 use function json_encode;
 
@@ -116,10 +117,7 @@ class FooterTest extends AbstractTestCase
         );
     }
 
-    /**
-     * Test for footer when ajax enabled
-     */
-    public function testAjax(): void
+    public function testGetDisplayWhenAjaxIsEnabled(): void
     {
         $footer = new Footer();
         $footer->setAjax(true);
@@ -167,4 +165,17 @@ class FooterTest extends AbstractTestCase
             $footer->getDisplay()
         );
     }
+
+    public function testSetAjax(): void
+    {
+        $isAjax = new ReflectionProperty(Footer::class, 'isAjax');
+        $isAjax->setAccessible(true);
+        $footer = new Footer();
+
+        $this->assertFalse($isAjax->getValue($footer));
+        $footer->setAjax(true);
+        $this->assertTrue($isAjax->getValue($footer));
+        $footer->setAjax(false);
+        $this->assertFalse($isAjax->getValue($footer));
+    }
 }
diff --git a/test/classes/HeaderTest.php b/test/classes/HeaderTest.php
index 20a17bd698..c9aa4f16a7 100644
--- a/test/classes/HeaderTest.php
+++ b/test/classes/HeaderTest.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace PhpMyAdmin\Tests;
 
+use PhpMyAdmin\Console;
 use PhpMyAdmin\Core;
 use PhpMyAdmin\Header;
 use ReflectionProperty;
@@ -245,4 +246,26 @@ class HeaderTest extends AbstractTestCase
             ],
         ];
     }
+
+    public function testSetAjax(): void
+    {
+        $header = new Header();
+        $consoleReflection = new ReflectionProperty(Header::class, 'console');
+        $consoleReflection->setAccessible(true);
+        $console = $consoleReflection->getValue($header);
+        $this->assertInstanceOf(Console::class, $console);
+        $isAjax = new ReflectionProperty(Header::class, 'isAjax');
+        $isAjax->setAccessible(true);
+        $consoleIsAjax = new ReflectionProperty(Console::class, 'isAjax');
+        $consoleIsAjax->setAccessible(true);
+
+        $this->assertFalse($isAjax->getValue($header));
+        $this->assertFalse($consoleIsAjax->getValue($console));
+        $header->setAjax(true);
+        $this->assertTrue($isAjax->getValue($header));
+        $this->assertTrue($consoleIsAjax->getValue($console));
+        $header->setAjax(false);
+        $this->assertFalse($isAjax->getValue($header));
+        $this->assertFalse($consoleIsAjax->getValue($console));
+    }
 }
diff --git a/test/classes/ResponseRendererTest.php b/test/classes/ResponseRendererTest.php
new file mode 100644
index 0000000000..dddd95b337
--- /dev/null
+++ b/test/classes/ResponseRendererTest.php
@@ -0,0 +1,59 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpMyAdmin\Tests;
+
+use PhpMyAdmin\Footer;
+use PhpMyAdmin\Header;
+use PhpMyAdmin\ResponseRenderer;
+use ReflectionProperty;
+
+/**
+ * @covers \PhpMyAdmin\ResponseRenderer
+ */
+class ResponseRendererTest extends AbstractTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $GLOBALS['lang'] = 'en';
+        $GLOBALS['server'] = 1;
+        $GLOBALS['text_dir'] = 'ltr';
+        $GLOBALS['PMA_PHP_SELF'] = 'index.php';
+    }
+
+    /**
+     * @runInSeparateProcess
+     * @preserveGlobalState disabled
+     */
+    public function testSetAjax(): void
+    {
+        $_REQUEST = [];
+        $response = ResponseRenderer::getInstance();
+        $header = $response->getHeader();
+        $footerReflection = new ReflectionProperty(ResponseRenderer::class, 'footer');
+        $footerReflection->setAccessible(true);
+        $footer = $footerReflection->getValue($response);
+        $this->assertInstanceOf(Footer::class, $footer);
+        $headerIsAjax = new ReflectionProperty(Header::class, 'isAjax');
+        $headerIsAjax->setAccessible(true);
+        $footerIsAjax = new ReflectionProperty(Footer::class, 'isAjax');
+        $footerIsAjax->setAccessible(true);
+
+        $this->assertFalse($response->isAjax());
+        $this->assertFalse($headerIsAjax->getValue($header));
+        $this->assertFalse($footerIsAjax->getValue($footer));
+
+        $response->setAjax(true);
+        $this->assertTrue($response->isAjax());
+        $this->assertTrue($headerIsAjax->getValue($header));
+        $this->assertTrue($footerIsAjax->getValue($footer));
+
+        $response->setAjax(false);
+        $this->assertFalse($response->isAjax());
+        $this->assertFalse($headerIsAjax->getValue($header));
+        $this->assertFalse($footerIsAjax->getValue($footer));
+    }
+}
diff --git a/test/classes/ResponseTest.php b/test/classes/ResponseTest.php
deleted file mode 100644
index 4593b06bee..0000000000
--- a/test/classes/ResponseTest.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace PhpMyAdmin\Tests;
-
-use PhpMyAdmin\ResponseRenderer;
-
-/**
- * @covers \PhpMyAdmin\ResponseRenderer
- */
-class ResponseTest extends AbstractTestCase
-{
-    protected function setUp(): void
-    {
-        parent::setUp();
-
-        $GLOBALS['lang'] = 'en';
-        $GLOBALS['server'] = 1;
-        $GLOBALS['text_dir'] = 'ltr';
-        $GLOBALS['PMA_PHP_SELF'] = 'index.php';
-    }
-
-    public function testSetAjax(): void
-    {
-        $_REQUEST = [];
-        $response = ResponseRenderer::getInstance();
-        $response->setAjax(true);
-        $this->assertTrue($response->isAjax());
-        $response->setAjax(false);
-        $this->assertFalse($response->isAjax());
-    }
-}