diff --git a/src/Core/Parser/SyntaxTree/ObjectAccessorNode.php b/src/Core/Parser/SyntaxTree/ObjectAccessorNode.php
index 616b1e7b4..a43fdc284 100644
--- a/src/Core/Parser/SyntaxTree/ObjectAccessorNode.php
+++ b/src/Core/Parser/SyntaxTree/ObjectAccessorNode.php
@@ -62,29 +62,42 @@ public function getObjectPath(): string
      */
     public function evaluate(RenderingContextInterface $renderingContext): mixed
     {
-        $objectPath = strtolower($this->objectPath);
         $variableProvider = $renderingContext->getVariableProvider();
-        if ($objectPath === '_all') {
-            return $variableProvider->getAll();
-        }
-        return $variableProvider->getByPath($this->objectPath);
+        return match (strtolower($this->objectPath)) {
+            '_all' => $variableProvider->getAll(),
+            'true' => true,
+            'false' => false,
+            'null' => null,
+            default => $variableProvider->getByPath($this->objectPath),
+        };
     }
 
     public function convert(TemplateCompiler $templateCompiler): array
     {
-        $path = $this->objectPath;
-        if ($path === '_all') {
-            return [
+        return match (strtolower($this->objectPath)) {
+            '_all' => [
                 'initialization' => '',
                 'execution' => '$renderingContext->getVariableProvider()->getAll()',
-            ];
-        }
-        return [
-            'initialization' => '',
-            'execution' => sprintf(
-                '$renderingContext->getVariableProvider()->getByPath(\'%s\')',
-                $path,
-            ),
-        ];
+            ],
+            'true' => [
+                'initialization' => '',
+                'execution' => 'true',
+            ],
+            'false' => [
+                'initialization' => '',
+                'execution' => 'false',
+            ],
+            'null' => [
+                'initialization' => '',
+                'execution' => 'null',
+            ],
+            default => [
+                'initialization' => '',
+                'execution' => sprintf(
+                    '$renderingContext->getVariableProvider()->getByPath(\'%s\')',
+                    $this->objectPath,
+                ),
+            ],
+        };
     }
 }
diff --git a/src/Core/Variables/InvalidVariableIdentifierException.php b/src/Core/Variables/InvalidVariableIdentifierException.php
new file mode 100644
index 000000000..792c17d5b
--- /dev/null
+++ b/src/Core/Variables/InvalidVariableIdentifierException.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file belongs to the package "TYPO3 Fluid".
+ * See LICENSE.txt that was shipped with this package.
+ */
+
+namespace TYPO3Fluid\Fluid\Core\Variables;
+
+class InvalidVariableIdentifierException extends \Exception {}
diff --git a/src/Core/Variables/StandardVariableProvider.php b/src/Core/Variables/StandardVariableProvider.php
index 648263057..872ba7e1f 100644
--- a/src/Core/Variables/StandardVariableProvider.php
+++ b/src/Core/Variables/StandardVariableProvider.php
@@ -14,6 +14,8 @@
  */
 class StandardVariableProvider implements VariableProviderInterface
 {
+    protected array $disallowedIdentifiers = ['null', 'true', 'false', '_all'];
+
     /**
      * Variables stored in context
      *
@@ -75,6 +77,9 @@ public function getAll(): array|\ArrayAccess
      */
     public function add(string $identifier, mixed $value): void
     {
+        if (in_array(strtolower($identifier), $this->disallowedIdentifiers)) {
+            throw new InvalidVariableIdentifierException('Invalid variable identifier: ' . $identifier, 1723131119);
+        }
         $this->variables[$identifier] = $value;
     }
 
diff --git a/tests/Unit/Core/Parser/SyntaxTree/ObjectAccessorNodeTest.php b/tests/Unit/Core/Parser/SyntaxTree/ObjectAccessorNodeTest.php
index d01db785b..5edc70cb8 100644
--- a/tests/Unit/Core/Parser/SyntaxTree/ObjectAccessorNodeTest.php
+++ b/tests/Unit/Core/Parser/SyntaxTree/ObjectAccessorNodeTest.php
@@ -28,6 +28,9 @@ public static function getEvaluateTestValues(): array
             [['foo' => ['bar' => 'test'], 'dynamic' => 'bar'], 'foo.{dynamic}', 'test'],
             [['foo' => ['bar' => 'test'], 'dynamic' => ['sub' => 'bar']], 'foo.{dynamic.sub}', 'test'],
             [['foo' => ['bar' => 'test'], 'dynamic' => ['sub' => 'bar'], 'baz' => 'sub'], 'foo.{dynamic.{baz}}', 'test'],
+            [[], 'true', true],
+            [[], 'false', false],
+            [[], 'null', null],
         ];
     }
 
@@ -43,7 +46,7 @@ public function testEvaluateGetsExpectedValue(array $variables, string $path, $e
         $variableContainer = new StandardVariableProvider($variables);
         $renderingContext->expects(self::any())->method('getVariableProvider')->willReturn($variableContainer);
         $value = $node->evaluate($renderingContext);
-        self::assertEquals($expected, $value);
+        self::assertSame($expected, $value);
     }
 
     #[Test]
diff --git a/tests/Unit/Core/Variables/StandardVariableProviderTest.php b/tests/Unit/Core/Variables/StandardVariableProviderTest.php
index 4839a9659..3ed261179 100644
--- a/tests/Unit/Core/Variables/StandardVariableProviderTest.php
+++ b/tests/Unit/Core/Variables/StandardVariableProviderTest.php
@@ -12,6 +12,7 @@
 use PHPUnit\Framework\Attributes\DataProvider;
 use PHPUnit\Framework\Attributes\Test;
 use PHPUnit\Framework\TestCase;
+use TYPO3Fluid\Fluid\Core\Variables\InvalidVariableIdentifierException;
 use TYPO3Fluid\Fluid\Core\Variables\StandardVariableProvider;
 use TYPO3Fluid\Fluid\Tests\Unit\Core\Variables\Fixtures\StandardVariableProviderModelFixture;
 
@@ -434,4 +435,13 @@ public function getByPathReturnsExpectedValues(array $variables, string $path, $
         $result = $subject->getByPath($path);
         self::assertEquals($expected, $result);
     }
+
+    #[Test]
+    public function exceptionIsThrownForInvalidVariableIdentifier(): void
+    {
+        self::expectException(InvalidVariableIdentifierException::class);
+        self::expectExceptionCode(1723131119);
+        $subject = new StandardVariableProvider();
+        $subject->add('TrUe', false);
+    }
 }