diff --git a/homeassistant/components/deconz/device_trigger.py b/homeassistant/components/deconz/device_trigger.py
index c5eda42bebc..e8322c18e9a 100644
--- a/homeassistant/components/deconz/device_trigger.py
+++ b/homeassistant/components/deconz/device_trigger.py
@@ -297,7 +297,7 @@ TRIGGER_SCHEMA = TRIGGER_BASE_SCHEMA.extend(
 
 def _get_deconz_event_from_device_id(hass, device_id):
     """Resolve deconz event from device id."""
-    for gateway in hass.data.get(DOMAIN):
+    for gateway in hass.data.get(DOMAIN, {}).values():
 
         for deconz_event in gateway.events:
 
diff --git a/tests/components/deconz/test_device_trigger.py b/tests/components/deconz/test_device_trigger.py
index b18113196ee..61962b00fe6 100644
--- a/tests/components/deconz/test_device_trigger.py
+++ b/tests/components/deconz/test_device_trigger.py
@@ -91,3 +91,26 @@ async def test_get_triggers(hass):
     ]
 
     assert_lists_same(triggers, expected_triggers)
+
+
+async def test_helper_successful(hass):
+    """Verify trigger helper."""
+    data = deepcopy(DECONZ_WEB_REQUEST)
+    data["sensors"] = deepcopy(SENSORS)
+    gateway = await setup_deconz_integration(hass, get_state_response=data)
+    device_id = gateway.events[0].device_id
+    deconz_event = device_trigger._get_deconz_event_from_device_id(hass, device_id)
+    assert deconz_event == gateway.events[0]
+
+
+async def test_helper_no_match(hass):
+    """Verify trigger helper returns None when no event could be matched."""
+    await setup_deconz_integration(hass)
+    deconz_event = device_trigger._get_deconz_event_from_device_id(hass, "mock-id")
+    assert deconz_event is None
+
+
+async def test_helper_no_gateway_exist(hass):
+    """Verify trigger helper returns None when no gateway exist."""
+    deconz_event = device_trigger._get_deconz_event_from_device_id(hass, "mock-id")
+    assert deconz_event is None