From 5cbbd8897218892b03ef28304f6b587ad37a84cb Mon Sep 17 00:00:00 2001
From: Vincent Gao <gaobing1230@gmail.com>
Date: Sat, 27 Jun 2026 12:19:03 +0200
Subject: [PATCH] fix: guard section params before validator setup

---
 src/bsblan/_validation.py    |  3 +++
 tests/test_api_validation.py | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/bsblan/_validation.py b/src/bsblan/_validation.py
index e4a6b2ea..4f756505 100644
--- a/src/bsblan/_validation.py
+++ b/src/bsblan/_validation.py
@@ -96,6 +96,9 @@ def get_section_params(self, section: SectionLiteral) -> dict[str, str]:
             dict[str, str]: Mapping of parameter id to parameter name.
 
         """
+        if not self._api_validator:
+            raise BSBLANError(ErrorMsg.API_VALIDATOR_NOT_INITIALIZED)
+
         return cast("APIValidator", self._api_validator).get_section_params(section)
 
     def apply_bus_specific_api_config(
diff --git a/tests/test_api_validation.py b/tests/test_api_validation.py
index 4250b7ce..121cb0ab 100644
--- a/tests/test_api_validation.py
+++ b/tests/test_api_validation.py
@@ -89,6 +89,18 @@ async def test_validate_api_section_no_validator() -> None:
             await bsblan._validator._validate_api_section("device")
 
 
+@pytest.mark.asyncio
+async def test_get_section_params_no_validator() -> None:
+    """Test section parameter lookup with no validator initialized."""
+    async with aiohttp.ClientSession() as session:
+        bsblan = BSBLAN(BSBLANConfig(host="example.com"), session=session)
+
+        bsblan._validator._api_validator = None
+
+        with pytest.raises(BSBLANError, match=ErrorMsg.API_VALIDATOR_NOT_INITIALIZED):
+            bsblan._validator.get_section_params("device")
+
+
 @pytest.mark.asyncio
 async def test_validate_api_section_no_api_data() -> None:
     """Test API section validation with no API data initialized."""