diff --git a/ets2panda/checker/ETSAnalyzerHelpers.cpp b/ets2panda/checker/ETSAnalyzerHelpers.cpp
index 295eaa49b553b6c13d76c64661dd37e793643b17..ae54c94cd1098f97884122315689b35296ad7951 100644
--- a/ets2panda/checker/ETSAnalyzerHelpers.cpp
+++ b/ets2panda/checker/ETSAnalyzerHelpers.cpp
@@ -51,7 +51,7 @@ void CheckExtensionIsShadowedInCurrentClassOrInterface(checker::ETSChecker *chec
 
     // check if there are class and interfaces' instance methods with the same name as extensions.
     auto *const methodVariable = objType->GetOwnProperty<checker::PropertyType::INSTANCE_METHOD>(methodName);
-    if (methodVariable == nullptr) {
+    if (methodVariable == nullptr || methodVariable->TsType()->IsTypeError()) {
         return;
     }
 
diff --git a/ets2panda/test/ast/compiler/ets/fuzz_invalid_method.ets b/ets2panda/test/ast/compiler/ets/fuzz_invalid_method.ets
new file mode 100644
index 0000000000000000000000000000000000000000..59a19d7b0f751117fa24951653eb86751117d5cf
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/fuzz_invalid_method.ets
@@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+
+function foo<T>(this:A<T>, p: T): T {
+    return this.data;
+}
+
+class A<T> {
+    data: T
+    goo
+        return this./* @@ label */classVal;
+    
+(): T {
+        return foo(this, this.data);
+    }
+
+}
+
+/* @@? 22:8 Error SyntaxError: Field type annotation expected. */
+/* @@? 23:9 Error SyntaxError: Unexpected token 'return'. */
+/* @@? 23:16 Error SyntaxError: Unexpected token 'this'. */
+/* @@? 23:20 Error SyntaxError: Unexpected token '.'. */
+/* @@? 23:43 Error SyntaxError: Field type annotation expected. */
+/* @@? 25:1 Error SyntaxError: Unexpected token '('. */
+/* @@? 25:2 Error SyntaxError: Unexpected token ')'. */
+/* @@? 25:3 Error SyntaxError: Unexpected token ':'. */
+/* @@? 25:6 Error SyntaxError: Field type annotation expected. */
+/* @@? 25:7 Error SyntaxError: Unexpected token '{'. */
+/* @@? 26:9 Error SyntaxError: Unexpected token 'return'. */
+/* @@? 26:19 Error TypeError: Only abstract or native methods can't have body. */
+/* @@? 26:24 Error SyntaxError: The function parameter 'this' must explicitly specify the typeAnnotation. */
+/* @@? 26:30 Error SyntaxError: Unexpected token, expected ',' or ')'. */
+/* @@? 26:30 Error SyntaxError: Unexpected token '.'. */
+/* @@? 26:30 Error SyntaxError: The function parameter 'this' must explicitly specify the typeAnnotation. */
+/* @@? 26:31 Error TypeError: Variable 'data' has already been declared. */
+/* @@? 26:31 Error TypeError: Property 'data' must be accessed through 'this' */
+/* @@? 26:35 Error SyntaxError: Field type annotation expected. */
+/* @@? 26:35 Error SyntaxError: Unexpected token ')'. */
+/* @@? 29:1 Error SyntaxError: Unexpected token '}'. */