diff --git a/pkg/vm_service/test/eval_issue_49209_test.dart b/pkg/vm_service/test/eval_issue_49209_test.dart
new file mode 100644
index 0000000..a0bbd56
--- /dev/null
+++ b/pkg/vm_service/test/eval_issue_49209_test.dart
@@ -0,0 +1,49 @@
+// Copyright (c) 2022, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:developer';
+import 'package:test/test.dart';
+import 'package:vm_service/vm_service.dart';
+import 'common/service_test_common.dart';
+import 'common/test_helper.dart';
+
+void testFunction() {
+  final a = A<C>();
+  print(a.runtimeType);
+  debugger();
+}
+
+class A<T> {
+  A();
+}
+
+class B<T> {
+  final T data;
+  B(this.data);
+}
+
+class C extends B<C> {
+  C(C data) : super(data);
+}
+
+var tests = <IsolateTest>[
+  hasStoppedAtBreakpoint,
+
+  // Evaluate against top frame.
+  (VmService service, IsolateRef isolateRef) async {
+    final isolateId = isolateRef.id!;
+    var topFrame = 0;
+    final dynamic result = await service.evaluateInFrame(
+        isolateId, topFrame, 'a.runtimeType.toString()');
+    print(result);
+    expect(result.valueAsString, equals("A<C>"));
+  },
+];
+
+main([args = const <String>[]]) => runIsolateTests(
+      args,
+      tests,
+      'eval_issue_49209_test.dart',
+      testeeConcurrent: testFunction,
+    );
diff --git a/runtime/vm/service.cc b/runtime/vm/service.cc
index c056360..85cf403 100644
--- a/runtime/vm/service.cc
+++ b/runtime/vm/service.cc
@@ -2881,6 +2881,13 @@
     output.Add(instance);
     return;
   }
+  if (type.IsTypeRef()) {
+    // A TypeRef is used to break cycles in the representation of types
+    // calling type class on it will cause an infinite recursion.
+    // We use null instead.
+    output.Add(instance);
+    return;
+  }
   const Class& cls = Class::Handle(type.type_class());
   const Library& lib = Library::Handle(zone, cls.library());