diff --git a/custom_components/nestquest/__init__.py b/custom_components/nestquest/__init__.py
index 2cfea93..78441f0 100644
--- a/custom_components/nestquest/__init__.py
+++ b/custom_components/nestquest/__init__.py
@@ -460,6 +460,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     database = await _async_open_database(hass, await async_get_db_path(hass))
     remove_update_listener: Callable[[], Any] | None = None
     remove_time_change_listener: Callable[[], Any] | None = None
+    coordinator: Any = None
     try:
         # Seed the admin allowlist on first setup so the owner is never
         # locked out: an empty database takes the persisted admin copy
@@ -528,6 +529,15 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
                     await result
             except BaseException:
                 pass
+        # A coordinator created before the failure holds entity
+        # listeners pointed at the database being closed below —
+        # shut it down FIRST so no scheduled refresh can ever run
+        # against a closed connection.
+        if coordinator is not None:
+            try:
+                await coordinator.async_shutdown()
+            except BaseException:
+                pass
         await database.close()
         raise
     assert remove_update_listener is not None
diff --git a/tests/test_coordinator.py b/tests/test_coordinator.py
index 414273a..745c53a 100644
--- a/tests/test_coordinator.py
+++ b/tests/test_coordinator.py
@@ -3,6 +3,8 @@ from __future__ import annotations
 
 import datetime
 
+import pytest
+
 from conftest import wire_entry_to_registry
 
 from custom_components.nestquest import async_setup_entry, async_unload_entry
@@ -242,3 +244,38 @@ async def test_coordinator_notifies_listeners_on_refresh(
     await coordinator.async_refresh()
     assert called == ["entity"]
     assert coordinator.last_update_success is True
+
+
+async def test_failed_first_refresh_shuts_coordinator_down(
+    hass, make_entry, monkeypatch
+) -> None:
+    """A setup failure after coordinator creation must not leak its
+    listeners against the database the except path closes."""
+    from custom_components.nestquest import async_setup_entry
+    import custom_components.nestquest.coordinator as coordinator_module
+
+    shutdown_calls = []
+
+    async def _record_shutdown(self):
+        shutdown_calls.append(self.entry_id)
+
+    monkeypatch.setattr(
+        coordinator_module.NestQuestCoordinator,
+        "async_shutdown",
+        _record_shutdown,
+    )
+
+    async def _boom(self):
+        raise RuntimeError("refresh failed")
+
+    monkeypatch.setattr(
+        coordinator_module.NestQuestCoordinator,
+        "_async_update_data",
+        _boom,
+    )
+
+    entry = wire_entry_to_registry(make_entry(), hass.registry)
+    with pytest.raises(RuntimeError, match="refresh failed"):
+        await async_setup_entry(hass, entry)
+    assert shutdown_calls == [entry.entry_id]
+    assert getattr(entry, "runtime_data", None) is None