diff --git a/calendar-bundle/src/Resources/contao/config/config.php b/calendar-bundle/src/Resources/contao/config/config.php
index 5ab60fbb043..47aec8b9f20 100644
--- a/calendar-bundle/src/Resources/contao/config/config.php
+++ b/calendar-bundle/src/Resources/contao/config/config.php
@@ -35,7 +35,7 @@
 $GLOBALS['TL_CRON']['daily']['generateCalendarFeeds'] = array('Calendar', 'generateFeeds');
 
 // Style sheet
-if (TL_MODE == 'BE')
+if (defined('TL_MODE') && TL_MODE == 'BE')
 {
 	$GLOBALS['TL_CSS'][] = 'bundles/contaocalendar/calendar.min.css|static';
 }
diff --git a/core-bundle/tests/Contao/RoutingTest.php b/core-bundle/tests/Contao/RoutingTest.php
index 493c6d89579..bafe1901335 100644
--- a/core-bundle/tests/Contao/RoutingTest.php
+++ b/core-bundle/tests/Contao/RoutingTest.php
@@ -47,7 +47,7 @@ public function setUp(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsThePageIdFromTheUrl(): void
     {
@@ -77,7 +77,7 @@ public function testReturnsThePageIdFromTheUrl(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsNullIfTheRequestIsEmpty(): void
     {
@@ -93,7 +93,7 @@ public function testReturnsNullIfTheRequestIsEmpty(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseIfTheRequestContainsAutoItem(): void
     {
@@ -123,7 +123,7 @@ public function testReturnsFalseIfTheRequestContainsAutoItem(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseIfTheUrlSuffixDoesNotMatch(): void
     {
@@ -153,7 +153,7 @@ public function testReturnsFalseIfTheUrlSuffixDoesNotMatch(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseUponDuplicateParameters(): void
     {
@@ -183,7 +183,7 @@ public function testReturnsFalseUponDuplicateParameters(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseIfTheRequestContainsAnAutoItemKeyword(): void
     {
@@ -214,7 +214,7 @@ public function testReturnsFalseIfTheRequestContainsAnAutoItemKeyword(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testDecodesTheRequestString(): void
     {
@@ -244,7 +244,7 @@ public function testDecodesTheRequestString(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testUnsetsEmptyFragments(): void
     {
@@ -278,7 +278,8 @@ public function testUnsetsEmptyFragments(): void
      *
      * @runInSeparateProcess
      * @preserveGlobalState disabled
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     *
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testAddsTheAutoItemFragment(): void
     {
@@ -311,7 +312,7 @@ public function testAddsTheAutoItemFragment(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsNullIfOnlyTheLanguageIsGiven(): void
     {
@@ -342,7 +343,7 @@ public function testReturnsNullIfOnlyTheLanguageIsGiven(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseIfTheLanguageIsNotProvided(): void
     {
@@ -373,7 +374,7 @@ public function testReturnsFalseIfTheLanguageIsNotProvided(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseIfTheAliasIsEmpty(): void
     {
@@ -405,7 +406,7 @@ public function testReturnsFalseIfTheAliasIsEmpty(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseIfThereAreNoFragments(): void
     {
@@ -441,7 +442,7 @@ public function testReturnsFalseIfThereAreNoFragments(): void
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testHandlesFolderUrlsWithoutLanguage(): void
     {
@@ -502,7 +503,7 @@ function (array $options) {
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testHandlesFolderUrlsWithLanguage(): void
     {
@@ -573,7 +574,7 @@ function (array $options) {
     }
 
     /**
-     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated and will no longer work in Contao 5.0. Use the Symfony routing instead.
+     * @expectedDeprecation Using Frontend::getPageIdFromUrl() has been deprecated %s.
      */
     public function testReturnsFalseIfThereAreNoAliases(): void
     {
diff --git a/core-bundle/tests/DependencyInjection/ContaoCoreExtensionTest.php b/core-bundle/tests/DependencyInjection/ContaoCoreExtensionTest.php
index ddefaad058f..9a653c9ff14 100644
--- a/core-bundle/tests/DependencyInjection/ContaoCoreExtensionTest.php
+++ b/core-bundle/tests/DependencyInjection/ContaoCoreExtensionTest.php
@@ -856,7 +856,7 @@ public function testRegistersTheContaoFramework(): void
 
         $this->assertSame(ContaoFramework::class, $definition->getClass());
         $this->assertTrue($definition->isPublic());
-        $this->assertSame(null, $definition->getArgument(0));
+        $this->assertNull($definition->getArgument(0));
         $this->assertSame('router', (string) $definition->getArgument(1));
         $this->assertSame('contao.routing.scope_matcher', (string) $definition->getArgument(2));
         $this->assertSame('%kernel.project_dir%', (string) $definition->getArgument(3));
diff --git a/core-bundle/tests/Functional/RoutingTest.php b/core-bundle/tests/Functional/RoutingTest.php
index a30d6a637c2..0d3cf61bc9f 100644
--- a/core-bundle/tests/Functional/RoutingTest.php
+++ b/core-bundle/tests/Functional/RoutingTest.php
@@ -46,6 +46,8 @@ protected function setUp(): void
         Input::resetUnusedGet();
         Environment::reset();
         InsertTags::reset();
+
+        Config::set('debugMode', false);
     }
 
     /**
diff --git a/faq-bundle/src/Resources/contao/config/config.php b/faq-bundle/src/Resources/contao/config/config.php
index 7b0e954e66a..624468d87d9 100644
--- a/faq-bundle/src/Resources/contao/config/config.php
+++ b/faq-bundle/src/Resources/contao/config/config.php
@@ -29,7 +29,7 @@
 ));
 
 // Style sheet
-if (TL_MODE == 'BE')
+if (defined('TL_MODE') && TL_MODE == 'BE')
 {
 	$GLOBALS['TL_CSS'][] = 'bundles/contaofaq/faq.min.css|static';
 }
diff --git a/news-bundle/src/Resources/contao/config/config.php b/news-bundle/src/Resources/contao/config/config.php
index dd0d0c0b3dc..cbd7c698e3e 100644
--- a/news-bundle/src/Resources/contao/config/config.php
+++ b/news-bundle/src/Resources/contao/config/config.php
@@ -35,7 +35,7 @@
 $GLOBALS['TL_CRON']['daily']['generateNewsFeeds'] = array('News', 'generateFeeds');
 
 // Style sheet
-if (TL_MODE == 'BE')
+if (defined('TL_MODE') && TL_MODE == 'BE')
 {
 	$GLOBALS['TL_CSS'][] = 'bundles/contaonews/news.min.css|static';
 }