diff --git a/ets2panda/checker/ETSAnalyzer.cpp b/ets2panda/checker/ETSAnalyzer.cpp
index b15d9a53136047ab9f0ff6128b5108d45e0d6332..5039837d1570686166184ef050c0d0d3fa524063 100644
--- a/ets2panda/checker/ETSAnalyzer.cpp
+++ b/ets2panda/checker/ETSAnalyzer.cpp
@@ -176,6 +176,11 @@ static void HandleNativeAndAsyncMethods(ETSChecker *checker, ir::MethodDefinitio
 
     if (util::Helpers::IsAsyncMethod(node)) {
         if (scriptFunc->ReturnTypeAnnotation() != nullptr) {
+            if (scriptFunc->Signature() == nullptr) {  // #23134
+                ES2PANDA_ASSERT(checker->IsAnyError());
+                return;
+            }
+
             auto *asyncFuncReturnType = scriptFunc->Signature()->ReturnType();
 
             if (!asyncFuncReturnType->IsETSObjectType() ||
diff --git a/ets2panda/test/ast/parser/ets/signature_return_type.ets b/ets2panda/test/ast/parser/ets/signature_return_type.ets
new file mode 100644
index 0000000000000000000000000000000000000000..daab0cbfa20176bbf5e863b5a6c6415b32f6a104
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/signature_return_type.ets
@@ -0,0 +1,29 @@
+/*
+ * 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.
+ */
+
+async a => ...delete const { p } = [];
+
+/* @@? 16:7 Error SyntaxError: 'async' flags must be used for functions only at top-level.  */
+/* @@? 16:9 Error SyntaxError: Unexpected token, expected an identifier.  */
+/* @@? 16:9 Error SyntaxError: Unexpected token, expected '('.  */
+/* @@? 16:12 Error SyntaxError: Rest parameter should be either array or tuple type.  */
+/* @@? 16:12 Error TypeError: The type of parameter 'delete' cannot be inferred  */
+/* @@? 16:22 Error SyntaxError: Parameter declaration should have an explicit type annotation.  */
+/* @@? 16:22 Error SyntaxError: Rest parameter must be the last formal parameter.  */
+/* @@? 16:30 Error TypeError: Unresolved reference p  */
+/* @@? 16:34 Error SyntaxError: Unexpected token '='.  */
+/* @@? 16:34 Error TypeError: Indexed access is not supported for such expression type.  */
+/* @@? 16:37 Error SyntaxError: Unexpected token ']'.  */
+/* @@? 16:38 Error SyntaxError: Unexpected token, expected ']'.  */