diff --git a/app/system/impl/native_python.py b/app/system/impl/native_python.py
index 5dfdb6f..031a681 100644
--- a/app/system/impl/native_python.py
+++ b/app/system/impl/native_python.py
@@ -69,7 +69,7 @@ class NativePythonSystem(SystemBase):
         # return an empty connection info object for now
         return Ok(ConnectionInfo())
 
-    @logger.catch(exclude=(HTTPException,))
+    @logger.catch(exclude=(HTTPException,), reraise=True)
     async def login(self, i: LoginInput) -> Result[Dict[str, str], Report]:
         # https://github.com/fusion44/blitz_api/issues/255
         pw = config("BAPI_NATIVE_LOGIN_PASSWORD", cast=str)
@@ -108,11 +108,11 @@ class NativePythonSystem(SystemBase):
             )
         )
 
-    @logger.catch(exclude=(HTTPException,))
     async def change_password(self, type: str, old_password: str, new_password: str):
+        # no @logger.catch: NotImplementedError must propagate to the service
+        # layer (which turns it into a 501), not be swallowed into a None return
         raise NotImplementedError()
 
-    @logger.catch(exclude=(HTTPException,))
     async def get_debug_logs_raw(self) -> RawDebugLogData:
         raise NotImplementedError()
 
diff --git a/tests/test_native_python_errors.py b/tests/test_native_python_errors.py
new file mode 100644
index 0000000..707cad1
--- /dev/null
+++ b/tests/test_native_python_errors.py
@@ -0,0 +1,36 @@
+"""
+Regression tests: the native_python system impl must not swallow exceptions.
+
+@logger.catch defaults to reraise=False, so methods that raise
+NotImplementedError silently returned None. The service layer relies on
+NotImplementedError propagating (to return 501) and on unexpected errors
+surfacing rather than becoming a None result.
+"""
+
+import pytest
+
+from app.system.impl import native_python as np
+
+
+def _system():
+    return np.NativePythonSystem()
+
+
+async def test_change_password_raises_not_implemented():
+    with pytest.raises(NotImplementedError):
+        await _system().change_password("a", "old", "new")
+
+
+async def test_get_debug_logs_raw_raises_not_implemented():
+    with pytest.raises(NotImplementedError):
+        await _system().get_debug_logs_raw()
+
+
+async def test_login_does_not_swallow_unexpected_errors(monkeypatch):
+    def boom(*args, **kwargs):
+        raise RuntimeError("config exploded")
+
+    monkeypatch.setattr(np, "config", boom)
+
+    with pytest.raises(RuntimeError):
+        await _system().login(np.LoginInput(password="12345678"))