diff --git a/ets2panda/checker/ets/helpers.cpp b/ets2panda/checker/ets/helpers.cpp
index 8be037eadd49d0a7fd4015ab2fc46536df8a43ac..94aa9345fa5936d9d8b295815e1ed0018111047d 100644
--- a/ets2panda/checker/ets/helpers.cpp
+++ b/ets2panda/checker/ets/helpers.cpp
@@ -1494,8 +1494,9 @@ static void CollectAliasParametersForBoxing(Type *expandedAliasType, std::set<Ty
         parametersNeedToBeBoxed.insert(expandedAliasType);
     } else if (expandedAliasType->IsETSObjectType()) {
         auto objectType = expandedAliasType->AsETSObjectType();
-        needToBeBoxed =
-            objectType->GetDeclNode()->IsClassDefinition() || objectType->GetDeclNode()->IsTSInterfaceDeclaration();
+        auto objectTypeNode = objectType->GetDeclNode();
+        needToBeBoxed = objectTypeNode != nullptr &&
+                        (objectTypeNode->IsClassDefinition() || objectTypeNode->IsTSInterfaceDeclaration());
         for (const auto typeArgument : objectType->TypeArguments()) {
             CollectAliasParametersForBoxing(typeArgument, parametersNeedToBeBoxed, needToBeBoxed);
         }
@@ -2480,6 +2481,10 @@ void ETSChecker::InferTypesForLambda(ir::ScriptFunction *lambda, ir::ETSFunction
                                      Signature *maybeSubstitutedFunctionSig)
 {
     for (size_t i = 0; i < lambda->Params().size(); ++i) {
+        if (!lambda->Params().at(i)->IsETSParameterExpression()) {
+            LogError(diagnostic::NO_SUCH_SIG_WITH_TRAILING_LAMBDA, {}, lambda->Params().at(i)->Start());
+            return;
+        }
         auto *const lambdaParam = lambda->Params().at(i)->AsETSParameterExpression()->Ident();
         if (lambdaParam->TypeAnnotation() == nullptr) {
             // SUPPRESS_CSA_NEXTLINE(alpha.core.AllocatorETSCheckerHint)
@@ -2508,6 +2513,10 @@ void ETSChecker::InferTypesForLambda(ir::ScriptFunction *lambda, Signature *sign
 {
     ES2PANDA_ASSERT(signature->Params().size() >= lambda->Params().size());
     for (size_t i = 0; i < lambda->Params().size(); ++i) {
+        if (!lambda->Params().at(i)->IsETSParameterExpression()) {
+            LogError(diagnostic::NO_SUCH_SIG_WITH_TRAILING_LAMBDA, {}, lambda->Params().at(i)->Start());
+            return;
+        }
         auto *const lambdaParam = lambda->Params().at(i)->AsETSParameterExpression()->Ident();
         if (lambdaParam->TypeAnnotation() == nullptr) {
             lambdaParam->Variable()->SetTsType(signature->Params().at(i)->TsType());
diff --git a/ets2panda/test/ast/parser/ets/lambda_param_array.ets b/ets2panda/test/ast/parser/ets/lambda_param_array.ets
new file mode 100644
index 0000000000000000000000000000000000000000..51caba27abf97084ffc6ab6b63855e8d21b8e5ff
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/lambda_param_array.ets
@@ -0,0 +1,31 @@
+/*
+ * 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.
+ */
+
+interface ResizeObserverEntry {}
+class ResizeObserver {
+    constructor(callback: (entries: ResizeObserverEntry[]) => void) {}
+    disconnect(): void {}
+    observe(target: Element): void {}
+    unobserve(target: Element): void {}
+}
+
+const resizeObserver = new ResizeObserver(([entry]) => {
+    // Dummy usage
+});
+
+/* @@? 20:21 Error TypeError: Cannot find type 'Element'. */
+/* @@? 21:23 Error TypeError: Cannot find type 'Element'. */
+/* @@? 24:43 Error TypeError: No matching call signature with trailing lambda */
+/* @@? 24:53 Error SyntaxError: Unexpected token '=>'. */