diff --git a/lib/WorseReflection/Bridge/TolerantParser/Reflection/TraitImport/TraitImports.php b/lib/WorseReflection/Bridge/TolerantParser/Reflection/TraitImport/TraitImports.php
index 4bf546548..bfeb4a325 100644
--- a/lib/WorseReflection/Bridge/TolerantParser/Reflection/TraitImport/TraitImports.php
+++ b/lib/WorseReflection/Bridge/TolerantParser/Reflection/TraitImport/TraitImports.php
@@ -15,6 +15,7 @@
 use Microsoft\PhpParser\Node\TraitUseClause;
 use Microsoft\PhpParser\TokenKind;
 use Phpactor\WorseReflection\Bridge\TolerantParser\Patch\TolerantQualifiedNameResolver;
+use Phpactor\WorseReflection\Core\Exception\NotFound;
 use Phpactor\WorseReflection\Core\Util\QualifiedNameListUtil;
 use Phpactor\WorseReflection\Core\Visibility;
 use RuntimeException;
@@ -107,7 +108,9 @@ private function __construct(array $declarations)
 
     public static function forClassDeclaration(ClassDeclaration|ObjectCreationExpression $classDeclaration): self
     {
-        assert($classDeclaration->classMembers instanceof ClassMembersNode, 'ObjectCreationExpression does not contain anonymous class');
+        if (!$classDeclaration->classMembers instanceof ClassMembersNode) {
+            throw new NotFound('ObjectCreationExpression does not contain anonymous class');
+        }
 
         return new self($classDeclaration->classMembers->classMemberDeclarations);
     }
diff --git a/lib/WorseReflection/Core/Reflection/Collection/ClassLikeReflectionMemberCollection.php b/lib/WorseReflection/Core/Reflection/Collection/ClassLikeReflectionMemberCollection.php
index 7c4d6ccc5..9bbdffdd9 100644
--- a/lib/WorseReflection/Core/Reflection/Collection/ClassLikeReflectionMemberCollection.php
+++ b/lib/WorseReflection/Core/Reflection/Collection/ClassLikeReflectionMemberCollection.php
@@ -25,6 +25,7 @@
 use Phpactor\WorseReflection\Bridge\TolerantParser\Reflection\ReflectionPromotedProperty;
 use Phpactor\WorseReflection\Bridge\TolerantParser\Reflection\ReflectionProperty;
 use Phpactor\WorseReflection\Core\ClassName;
+use Phpactor\WorseReflection\Core\Exception\NotFound;
 use Phpactor\WorseReflection\Core\Reflection\ReflectionClass;
 use Phpactor\WorseReflection\Core\Reflection\ReflectionClassLike;
 use Phpactor\WorseReflection\Core\Reflection\ReflectionConstant as PhpactorReflectionConstant;
@@ -73,7 +74,9 @@ public static function fromClassMemberDeclarations(
         ClassDeclaration|ObjectCreationExpression $class,
         ReflectionClass $reflectionClass
     ): self {
-        assert($class->classMembers instanceof ClassMembersNode, 'ObjectCreationExpression does not contain anonymous class');
+        if (!$class->classMembers instanceof ClassMembersNode) {
+            throw new NotFound('ObjectCreationExpression does not contain anonymous class');
+        }
 
         return self::fromDeclarations(
             $serviceLocator,
diff --git a/lib/WorseReflection/Core/Reflection/Collection/ReflectionTraitCollection.php b/lib/WorseReflection/Core/Reflection/Collection/ReflectionTraitCollection.php
index aefbf733d..22e32faca 100644
--- a/lib/WorseReflection/Core/Reflection/Collection/ReflectionTraitCollection.php
+++ b/lib/WorseReflection/Core/Reflection/Collection/ReflectionTraitCollection.php
@@ -23,7 +23,9 @@ public static function fromClassDeclaration(
         ServiceLocator $serviceLocator,
         ClassDeclaration|ObjectCreationExpression $class,
     ): self {
-        assert($class->classMembers instanceof ClassMembersNode, 'ObjectCreationExpression does not contain anonymous class');
+        if (!$class->classMembers instanceof ClassMembersNode) {
+            throw new NotFound('ObjectCreationExpression does not contain anonymous class');
+        }
 
         $items = [];
         foreach ($class->classMembers->classMemberDeclarations as $memberDeclaration) {
diff --git a/lib/WorseReflection/Core/Reflector/CoreReflector.php b/lib/WorseReflection/Core/Reflector/CoreReflector.php
index 6c576df84..0b398be35 100644
--- a/lib/WorseReflection/Core/Reflector/CoreReflector.php
+++ b/lib/WorseReflection/Core/Reflector/CoreReflector.php
@@ -5,6 +5,7 @@
 use Amp\Promise;
 use Generator;
 use Microsoft\PhpParser\Node;
+use Microsoft\PhpParser\Node\Expression\ObjectCreationExpression;
 use Phpactor\TextDocument\ByteOffset;
 use Phpactor\WorseReflection\Bridge\TolerantParser\Reflection\ReflectionNavigation;
 use Phpactor\WorseReflection\Core\ClassName;
@@ -38,6 +39,11 @@ public function __construct(private SourceCodeReflector $sourceReflector, privat
     {
     }
 
+    public static function getAnonymousClassName(ObjectCreationExpression $class): string
+    {
+
+    }
+
     /**
      * Reflect class.
      *