diff --git a/ets2panda/checker/ets/helpers.cpp b/ets2panda/checker/ets/helpers.cpp
index 5e11b6fe85bcd2bd0d6a3a5efd8020b9a5f2240a..e2c83a6116993214c92b69ec2ec19efbbcec211f 100644
--- a/ets2panda/checker/ets/helpers.cpp
+++ b/ets2panda/checker/ets/helpers.cpp
@@ -77,11 +77,15 @@ void ETSChecker::CheckTruthinessOfType(ir::Expression *expr)
     checker::Type *type = expr->Check(this);
     auto *unboxed_type = ETSBuiltinTypeAsConditionalType(type);
 
+    if (unboxed_type == nullptr) {
+        ThrowTypeError("Condition must be of possible condition type", expr->Start());
+    }
+
     if (unboxed_type == GlobalBuiltinVoidType() || unboxed_type->IsETSVoidType()) {
         ThrowTypeError("An expression of type 'void' cannot be tested for truthiness", expr->Start());
     }
 
-    if (unboxed_type != nullptr && !unboxed_type->IsConditionalExprType()) {
+    if (!unboxed_type->IsConditionalExprType()) {
         ThrowTypeError("Condition must be of possible condition type", expr->Start());
     }
 
diff --git a/ets2panda/test/CMakeLists.txt b/ets2panda/test/CMakeLists.txt
index 9bb12430391fd061eb05526770eeef7f02e5d3f7..a76d250a09ea8132b6c0d31c5362cdd00cd5978b 100644
--- a/ets2panda/test/CMakeLists.txt
+++ b/ets2panda/test/CMakeLists.txt
@@ -133,7 +133,19 @@ if(PANDA_WITH_ETS)
 
                     SANITIZERS
                     ${PANDA_SANITIZERS_LIST}
-           )
+            )
+            panda_add_gtest(
+                NAME es2panda_checker_tests
+                SOURCES
+                    unit/checker_test.cpp
+                LIBRARIES
+                    es2panda-public es2panda-lib
+                INCLUDE_DIRS
+                    ${ES2PANDA_ROOT}
+                SANITIZERS
+                    ${PANDA_SANITIZERS_LIST}
+            )
+
     endif()
 
     panda_add_gtest(
diff --git a/ets2panda/test/unit/checker_test.cpp b/ets2panda/test/unit/checker_test.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..69a0519e62ef2ae3fe2fe6d5048bfb411b431616
--- /dev/null
+++ b/ets2panda/test/unit/checker_test.cpp
@@ -0,0 +1,59 @@
+/**
+ * Copyright (c) 2021-2023 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.
+ */
+
+#include <gtest/gtest.h>
+#include "macros.h"
+#include "public/es2panda_lib.h"
+
+class CheckerTest : public testing::Test {
+public:
+    CheckerTest()
+    {
+        impl_ = es2panda_GetImpl(ES2PANDA_LIB_VERSION);
+        // NOLINTNEXTLINE(modernize-avoid-c-arrays)
+        char const *argv[] = {"test"};
+        cfg_ = impl_->CreateConfig(1, argv);
+    }
+
+    ~CheckerTest() override
+    {
+        impl_->DestroyConfig(cfg_);
+    }
+
+    NO_COPY_SEMANTIC(CheckerTest);
+    NO_MOVE_SEMANTIC(CheckerTest);
+
+protected:
+    // NOLINTBEGIN(misc-non-private-member-variables-in-classes)
+    es2panda_Impl const *impl_;
+    es2panda_Config *cfg_;
+    // NOLINTEND(misc-non-private-member-variables-in-classes)
+};
+
+TEST_F(CheckerTest, ExtendedConditionalExpressionFunctor)
+{
+    char const *text = R"XXX(
+class A {
+    m() {}
+    m2() { this.m ? "a": "b" }
+}
+)XXX";
+    es2panda_Context *ctx = impl_->CreateContextFromString(cfg_, text, "dummy.ets");
+    ctx = impl_->ProceedToState(ctx, ES2PANDA_STATE_CHECKED);
+    ASSERT_EQ(std::string(impl_->ContextErrorMessage(ctx)),
+              "TypeError: Condition must be of possible condition type[dummy.ets:4,12]");
+
+    impl_->DestroyContext(ctx);
+}
\ No newline at end of file