diff --git a/ets2panda/ast_verifier/helpers.cpp b/ets2panda/ast_verifier/helpers.cpp
index a2179fc411ba0b24db631a82db400ba318fc1b32..ba2f9d53c48b5318895685faf81ecc6af4e024f3 100644
--- a/ets2panda/ast_verifier/helpers.cpp
+++ b/ets2panda/ast_verifier/helpers.cpp
@@ -268,7 +268,8 @@ bool ValidateVariableAccess(const varbinder::LocalVariable *propVar, const ir::M
 
     // NOTE: need to refactor: type of member expression object can be obtained via
     // me->ObjType() or me->Object()->TsType() and they may differ!!!!
-    if (auto objType = const_cast<ir::MemberExpression *>(ast)->Object()->TsType(); objType->IsETSUnionType()) {
+    if (auto objType = const_cast<ir::MemberExpression *>(ast)->Object()->TsType();
+        objType != nullptr && objType->IsETSUnionType()) {
         bool res = true;
         for (auto type : objType->AsETSUnionType()->ConstituentTypes()) {
             const_cast<ir::MemberExpression *>(ast)->SetObjectType(type->AsETSObjectType());
diff --git a/ets2panda/compiler/lowering/ets/unboxLowering.cpp b/ets2panda/compiler/lowering/ets/unboxLowering.cpp
index b33a59d270584c698ec77ae62812a7015fb7b121..0cf2d12eff6a3e345a513f0cd37bb6cfb7a665e1 100644
--- a/ets2panda/compiler/lowering/ets/unboxLowering.cpp
+++ b/ets2panda/compiler/lowering/ets/unboxLowering.cpp
@@ -1193,7 +1193,7 @@ struct UnboxVisitor : public ir::visitor::EmptyAstVisitor {
                 if (mexpr->Property()->Variable()->Declaration() != nullptr &&
                     mexpr->Property()->Variable()->Declaration()->Node() != nullptr &&
                     mexpr->Property()->Variable()->Declaration()->Node()->IsTyped() &&
-                    !mexpr->Object()->TsType()->IsETSAnyType()) {
+                    mexpr->Object()->TsType() != nullptr && !mexpr->Object()->TsType()->IsETSAnyType()) {
                     HandleDeclarationNode(uctx_, mexpr->Property()->Variable()->Declaration()->Node());
                     propType = mexpr->Property()->Variable()->Declaration()->Node()->AsTyped()->TsType();
                 } else if (mexpr->Property()->Variable()->TsType() != nullptr) {
@@ -1219,7 +1219,8 @@ struct UnboxVisitor : public ir::visitor::EmptyAstVisitor {
                        mexpr->Property()->AsIdentifier()->Name() == "length") {
                 mexpr->SetTsType(uctx_->checker->GlobalIntType());
             }
-            if (mexpr->Object()->TsType()->IsETSPrimitiveType() && !IsStaticMemberExpression(mexpr)) {
+            if (mexpr->Object()->TsType() != nullptr && mexpr->Object()->TsType()->IsETSPrimitiveType() &&
+                !IsStaticMemberExpression(mexpr)) {
                 // NOTE(gogabr): need to handle some elementary method calls as intrinsics
                 mexpr->SetObject(InsertBoxing(uctx_, mexpr->Object()));
             }
diff --git a/ets2panda/test/ast/compiler/ets/declaration_default_values.ets b/ets2panda/test/ast/compiler/ets/declaration_default_values.ets
new file mode 100644
index 0000000000000000000000000000000000000000..373f0f09c56c954c80a5f7e7e6ebf6661d607dda
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/declaration_default_values.ets
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace MyNamespace {
+    export enum MyEnum {
+        EnumField1 = 0,
+        EnumField2 = 1
+    }
+}
+
+@interface ClassAnnotation {
+    field1: MyNamespace.MyEnum = MyNamespace.MyEnum.EnumField1;
+}
+
+
+@ClassAnnotation
+class MyClass {
+    field2: MyNamespace.MyEnum = MyNamespace.MyEnum.EnumField2;
+}
+
+function test() { 
+    let myClass = new MyClass();
+    arktest.assertEQ(myClass.field2, 1);
+}
+
+test()