diff --git a/homeassistant/components/rfxtrx/__init__.py b/homeassistant/components/rfxtrx/__init__.py
index 947a945eee7..a7f7425fb81 100644
--- a/homeassistant/components/rfxtrx/__init__.py
+++ b/homeassistant/components/rfxtrx/__init__.py
@@ -156,6 +156,8 @@ async def async_setup(hass, config):
     # Read device_id from the event code add to the data that will end up in the ConfigEntry
     for event_code, event_config in data[CONF_DEVICES].items():
         event = get_rfx_object(event_code)
+        if event is None:
+            continue
         device_id = get_device_id(
             event.device, data_bits=event_config.get(CONF_DATA_BITS)
         )
@@ -229,6 +231,8 @@ def _get_device_lookup(devices):
     lookup = dict()
     for event_code, event_config in devices.items():
         event = get_rfx_object(event_code)
+        if event is None:
+            continue
         device_id = get_device_id(
             event.device, data_bits=event_config.get(CONF_DATA_BITS)
         )
diff --git a/tests/components/rfxtrx/test_binary_sensor.py b/tests/components/rfxtrx/test_binary_sensor.py
index 11efcfb6510..ee757192aaf 100644
--- a/tests/components/rfxtrx/test_binary_sensor.py
+++ b/tests/components/rfxtrx/test_binary_sensor.py
@@ -69,6 +69,35 @@ async def test_one_pt2262(hass, rfxtrx):
     assert state.state == "off"
 
 
+async def test_pt2262_unconfigured(hass, rfxtrx):
+    """Test with discovery for PT2262."""
+    assert await async_setup_component(
+        hass,
+        "rfxtrx",
+        {
+            "rfxtrx": {
+                "device": "abcd",
+                "devices": {
+                    "0913000022670e013970": {},
+                    "09130000226707013970": {},
+                },
+            }
+        },
+    )
+    await hass.async_block_till_done()
+    await hass.async_start()
+
+    state = hass.states.get("binary_sensor.pt2262_22670e")
+    assert state
+    assert state.state == "off"  # probably aught to be unknown
+    assert state.attributes.get("friendly_name") == "PT2262 22670e"
+
+    state = hass.states.get("binary_sensor.pt2262_226707")
+    assert state
+    assert state.state == "off"  # probably aught to be unknown
+    assert state.attributes.get("friendly_name") == "PT2262 226707"
+
+
 @pytest.mark.parametrize(
     "state,event",
     [["on", "0b1100cd0213c7f230010f71"], ["off", "0b1100cd0213c7f230000f71"]],
@@ -262,3 +291,35 @@ async def test_light(hass, rfxtrx_automatic):
 
     await rfxtrx.signal(EVENT_LIGHT_DETECTOR_DARK)
     assert hass.states.get(entity_id).state == "off"
+
+
+async def test_pt2262_duplicate_id(hass, rfxtrx):
+    """Test with 1 sensor."""
+    assert await async_setup_component(
+        hass,
+        "rfxtrx",
+        {
+            "rfxtrx": {
+                "device": "abcd",
+                "devices": {
+                    "0913000022670e013970": {
+                        "data_bits": 4,
+                        "command_on": 0xE,
+                        "command_off": 0x7,
+                    },
+                    "09130000226707013970": {
+                        "data_bits": 4,
+                        "command_on": 0xE,
+                        "command_off": 0x7,
+                    },
+                },
+            }
+        },
+    )
+    await hass.async_block_till_done()
+    await hass.async_start()
+
+    state = hass.states.get("binary_sensor.pt2262_22670e")
+    assert state
+    assert state.state == "off"  # probably aught to be unknown
+    assert state.attributes.get("friendly_name") == "PT2262 22670e"
diff --git a/tests/components/rfxtrx/test_cover.py b/tests/components/rfxtrx/test_cover.py
index ce4838cebf1..05ce26ebc10 100644
--- a/tests/components/rfxtrx/test_cover.py
+++ b/tests/components/rfxtrx/test_cover.py
@@ -114,3 +114,26 @@ async def test_discover_covers(hass, rfxtrx_automatic):
     state = hass.states.get("cover.lightwaverf_siemens_f394ab_2")
     assert state
     assert state.state == "open"
+
+
+async def test_duplicate_cover(hass, rfxtrx):
+    """Test with 2 duplicate covers."""
+    assert await async_setup_component(
+        hass,
+        "rfxtrx",
+        {
+            "rfxtrx": {
+                "device": "abcd",
+                "devices": {
+                    "0b1400cd0213c7f20d010f51": {},
+                    "0b1400cd0213c7f20d010f50": {},
+                },
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    state = hass.states.get("cover.lightwaverf_siemens_0213c7_242")
+    assert state
+    assert state.state == "closed"
+    assert state.attributes.get("friendly_name") == "LightwaveRF, Siemens 0213c7:242"
diff --git a/tests/components/rfxtrx/test_switch.py b/tests/components/rfxtrx/test_switch.py
index 3256f303708..1fed6a65562 100644
--- a/tests/components/rfxtrx/test_switch.py
+++ b/tests/components/rfxtrx/test_switch.py
@@ -3,6 +3,7 @@ from unittest.mock import call
 
 import pytest
 
+from homeassistant.components.rfxtrx import DOMAIN
 from homeassistant.core import State
 from homeassistant.setup import async_setup_component
 
@@ -151,3 +152,24 @@ async def test_discover_rfy_sun_switch(hass, rfxtrx_automatic):
     state = hass.states.get("switch.rfy_030101_1")
     assert state
     assert state.state == "on"
+
+
+async def test_unknown_event_code(hass, rfxtrx):
+    """Test with 3 switches."""
+    assert await async_setup_component(
+        hass,
+        "rfxtrx",
+        {
+            "rfxtrx": {
+                "device": "abcd",
+                "devices": {"1234567890": {}},
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    conf_entries = hass.config_entries.async_entries(DOMAIN)
+    assert len(conf_entries) == 1
+
+    entry = conf_entries[0]
+    assert entry.state == "loaded"