diff --git a/ets2panda/checker/ets/function.cpp b/ets2panda/checker/ets/function.cpp
index b10a5e7edbf30a99907595fac61122e3559db908..4a45ddbe2782b82539650d8936f8e76065f775a8 100644
--- a/ets2panda/checker/ets/function.cpp
+++ b/ets2panda/checker/ets/function.cpp
@@ -437,6 +437,12 @@ bool ETSChecker::ValidateSignatureRequiredParams(Signature *substitutedSig,
     if ((flags & TypeRelationFlag::NO_CHECK_TRAILING_LAMBDA) != 0) {
         commonArity = commonArity - 1;
     }
+
+    // Note: When the script is abnormal, the variable is redefined.
+    // This causes the TsType of the variable originally used as a function parameter to be modified to null.
+    if (commonArity > 0 && substitutedSig->Params()[0]->TsType() == nullptr) {
+        return false;
+    }
     for (size_t index = 0; index < commonArity; ++index) {
         auto &argument = arguments[index];
 
diff --git a/ets2panda/test/ast/compiler/ets/repeate_var.ets b/ets2panda/test/ast/compiler/ets/repeate_var.ets
new file mode 100755
index 0000000000000000000000000000000000000000..f24400cea583a97383651dac633c8783108fa00d
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/repeate_var.ets
@@ -0,0 +1,40 @@
+/*
+ * 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.
+ */
+
+import {StdDebug} from "std/debug"
+
+type L = StdDebug.Logger
+function run_await_chain(len: int): int {
+    let buffer: Array<int>
+    let capacity: number = 20
+
+    const buf = this.buffer
+    const len = buf.length
+    let arrayObj: Record<String, int> = {}
+    for (let i = 0; i < len; i++) {
+        arrayObj[String(i)] = i
+    }
+}
+
+function main(): int {
+    if (run_await_chain(50) != 0) {
+        L.logError("await chain test failed");
+        return 1;
+    }
+}
+
+/* @@? 23:17 Error TypeError: Cannot reference 'this' in this context.  */
+/* @@? 23:22 Error TypeError: Property 'buffer' does not exist on type 'Error'  */
+/* @@? 24:11 Error TypeError: Variable 'len' has already been declared.  */