diff --git a/ets2panda/ir/expressions/memberExpression.cpp b/ets2panda/ir/expressions/memberExpression.cpp
index 016e43c9e5d561f6d18a8326d0167ae20709b249..0ef64ebe13611dbe379df679e95d7691ffc382ae 100644
--- a/ets2panda/ir/expressions/memberExpression.cpp
+++ b/ets2panda/ir/expressions/memberExpression.cpp
@@ -202,7 +202,8 @@ checker::Type *MemberExpression::TraverseUnionMember(checker::ETSChecker *checke
             return;
         }
 
-        if (memberType == nullptr) {
+        if (memberType == nullptr || !(commonPropType->IsETSMethodType() && memberType->IsETSMethodType())) {
+            commonPropType = checker->GlobalTypeError();
             checker->LogError(diagnostic::MEMBER_TYPE_MISMATCH_ACROSS_UNION, {}, Start());
             return;
         }
diff --git a/ets2panda/test/ast/compiler/ets/union_method6.ets b/ets2panda/test/ast/compiler/ets/union_method6.ets
new file mode 100644
index 0000000000000000000000000000000000000000..c3dc0922a040e49354fd26cf08440910620862b2
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/union_method6.ets
@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+class A {
+    foo<T, U>(x: T, y: U) {}
+}
+
+interface B {
+    foo?: () => void;
+}
+
+function foo6(x: A | B) {
+    if ('foo' in x && x.foo) {
+        return;
+    }
+}
+
+/* @@? 25:15 Error SyntaxError: Expected ')', got 'identification literal'. */
+/* @@? 25:15 Error TypeError: Unresolved reference in */
+/* @@? 25:18 Error SyntaxError: Unexpected token 'x'. */
+/* @@? 25:23 Error TypeError: Member type must be the same for all union objects. */
+/* @@? 25:28 Error SyntaxError: Unexpected token ')'. */
+/* @@? 25:30 Error SyntaxError: Unexpected token '{'. */