Secure against resetting a non active modbus (#115364)

homeassistant/components/modbus/__init__.py

@@ -463,6 +463,9 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
 
 async def async_reset_platform(hass: HomeAssistant, integration_name: str) -> None:
     """Release modbus resources."""
+    if DOMAIN not in hass.data:
+        _LOGGER.error("Modbus cannot reload, because it was never loaded")
+        return
     _LOGGER.info("Modbus reloading")
     hubs = hass.data[DOMAIN]
     for name in hubs:

tests/components/modbus/test_init.py

@@ -25,6 +25,7 @@ import voluptuous as vol
 
 from homeassistant import config as hass_config
 from homeassistant.components.binary_sensor import DOMAIN as BINARY_SENSOR_DOMAIN
+from homeassistant.components.modbus import async_reset_platform
 from homeassistant.components.modbus.const import (
     ATTR_ADDRESS,
     ATTR_HUB,
@@ -1781,3 +1782,9 @@ async def test_no_entities(hass: HomeAssistant) -> None:
         ]
     }
     assert await async_setup_component(hass, DOMAIN, config) is False
+
+
+async def test_reset_platform(hass: HomeAssistant) -> None:
+    """Run test for async_reset_platform."""
+    await async_reset_platform(hass, "modbus")
+    assert DOMAIN not in hass.data