diff --git a/lib/Controller/Views/CattoolController.php b/lib/Controller/Views/CattoolController.php
index c67468311b..45b8c43f80 100644
--- a/lib/Controller/Views/CattoolController.php
+++ b/lib/Controller/Views/CattoolController.php
@@ -186,7 +186,7 @@ public function renderView(): void
             'pageTitle' => $this->buildPageTitle($revisionNumber, $chunkStruct),
             'password' => $chunkStruct->password,
             'project' => $chunkStruct->getProject(),
-            'project_name' => $chunkStruct->getProject()->name,
+            'project_name' => Utils::friendlySlug($chunkStruct->getProject()->name),
             'quality_report_href' => AppConfig::$BASEURL . "revise-summary/$chunkStruct->id-$chunkStruct->password",
             'review_extended' => new PHPTalBoolean(true),
             'review_password' => $isRevision ? $chunkReviewStruct->review_password : (new ChunkReviewDao())->findChunkReviewsForSourcePage(
diff --git a/tests/unit/Utils/Tools/UtilsTest.php b/tests/unit/Utils/Tools/UtilsTest.php
index 6588659c35..952f801968 100644
--- a/tests/unit/Utils/Tools/UtilsTest.php
+++ b/tests/unit/Utils/Tools/UtilsTest.php
@@ -241,6 +241,45 @@ public function testFriendlySlugRemovesSpecialCharacters(): void
         $this->assertMatchesRegularExpression('/^[a-z0-9\-]+$/', $result);
     }
 
+    #[Test]
+    public function testFriendlySlugReturnsHyphenForEmptyStringInput(): void
+    {
+        $result = Utils::friendlySlug('');
+        $this->assertEquals('-', $result);
+    }
+
+    #[Test]
+    public function testFriendlySlugHandlesValidAsciiSymbol(): void
+    {
+        $result = Utils::friendlySlug('hello-world');
+        $this->assertEquals('hello-world', $result);
+    }
+
+    #[Test]
+    public function testFriendlySlugStripsLogicalNegationSymbol(): void
+    {
+        $result = Utils::friendlySlug('hello¬world');
+        $this->assertMatchesRegularExpression('/^[a-z0-9\-]+$/', $result);
+        $this->assertStringNotContainsString('¬', $result);
+    }
+
+    #[Test]
+    public function testFriendlySlugStripsBoxDrawingCharacter(): void
+    {
+        $result = Utils::friendlySlug('╚══test══╝');
+        $this->assertMatchesRegularExpression('/^[a-z0-9\-]+$/', $result);
+        $this->assertStringNotContainsString('╚', $result);
+        $this->assertStringNotContainsString('═', $result);
+    }
+
+    #[Test]
+    public function testFriendlySlugStripsBlockGraphicSymbol(): void
+    {
+        $result = Utils::friendlySlug('hello░world');
+        $this->assertMatchesRegularExpression('/^[a-z0-9\-]+$/', $result);
+        $this->assertStringNotContainsString('░', $result);
+    }
+
     // =========================================================================
     // Tests for replace_accents()
     // =========================================================================