diff --git a/ets2panda/checker/checkerContext.cpp b/ets2panda/checker/checkerContext.cpp
index b8da863c9b340d571fb4daa2bd1bab4c91eeea8f..28bf22ca9231c641dc7fb9f1b5f876d75065cc7e 100644
--- a/ets2panda/checker/checkerContext.cpp
+++ b/ets2panda/checker/checkerContext.cpp
@@ -473,10 +473,6 @@ void CheckerContext::OnBreakStatement(ir::BreakStatement const *breakStatement)
 
     status_ |= CheckerStatus::MEET_BREAK;
 
-    if (smartCasts_.empty()) {
-        return;
-    }
-
     SmartCastArray smartCasts {};
     smartCasts.reserve(smartCasts_.size());
 
@@ -486,9 +482,7 @@ void CheckerContext::OnBreakStatement(ir::BreakStatement const *breakStatement)
         }
     }
 
-    if (!smartCasts.empty()) {
-        AddBreakSmartCasts(targetStatement, std::move(smartCasts));
-    }
+    AddBreakSmartCasts(targetStatement, std::move(smartCasts));
 
     ClearSmartCasts();
 }
diff --git a/ets2panda/test/ast/compiler/ets/smart_cast_while_test_mod.sts b/ets2panda/test/ast/compiler/ets/smart_cast_while_test_mod.ets
similarity index 100%
rename from ets2panda/test/ast/compiler/ets/smart_cast_while_test_mod.sts
rename to ets2panda/test/ast/compiler/ets/smart_cast_while_test_mod.ets
diff --git a/ets2panda/test/ast/compiler/ets/smart_cast_wuth_break.ets b/ets2panda/test/ast/compiler/ets/smart_cast_wuth_break.ets
new file mode 100644
index 0000000000000000000000000000000000000000..aedd842942ecc7d3995d365635d377ee9ba0d2a9
--- /dev/null
+++ b/ets2panda/test/ast/compiler/ets/smart_cast_wuth_break.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.
+ */
+
+
+function foo(str: string | undefined): undefined {
+  let x: string | undefined = undefined;
+  for (let i = 0; i < 1; ++i) {
+    x = str;
+    if (x == "a") {
+      break;
+    } else {
+      x = undefined;
+    }
+  }
+  return /* @@ label */x;
+}
+
+
+function main() {
+  console.log(foo("a"));
+}
+
+/* @@@ label Error TypeError: Type 'String|undefined' is not compatible with the enclosing method's return type 'undefined' */