diff --git a/ets2panda/test/ast/parser/ets/lexer003.ets b/ets2panda/test/ast/parser/ets/lexer003.ets
new file mode 100644
index 0000000000000000000000000000000000000000..6e9900937bba4668ec5615a8ec6df2a61ba96918
--- /dev/null
+++ b/ets2panda/test/ast/parser/ets/lexer003.ets
@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+
+/* @@? 24:1 Error SyntaxError: Unexpected token, expected '`'. */
+/* @@? 24:4 Error TypeError: Unresolved reference message */
+/* @@? 24:15 Error SyntaxError: Unterminated string. */
+/* @@? 24:19 Error SyntaxError: Unterminated string. */
+/* @@? 24:19 Error SyntaxError: Unexpected token, expected '${' or '`' */
+/* @@? 24:19 Error SyntaxError: Unexpected token, expected '`'. */
+/* @@? 24:19 Error SyntaxError: Expected '}', got 'end of stream'. */
+
+`${message ?? 'ver
\ No newline at end of file
diff --git a/ets2panda/util/ustring.h b/ets2panda/util/ustring.h
index b9106cc62b8ab5f26d9590eaea6d3be788d3f6a9..c6becf16614575173d071e2f53c4c52ea5dd77c8 100644
--- a/ets2panda/util/ustring.h
+++ b/ets2panda/util/ustring.h
@@ -202,7 +202,6 @@ public:
 
         inline void Reset(size_t offset)
         {
-            ES2PANDA_ASSERT(sv_.begin() + offset <= sv_.end());
             iter_ = sv_.begin() + offset;
         }