diff --git a/homeassistant/components/flux_led/light.py b/homeassistant/components/flux_led/light.py
index 4298a4f11e6..655b868a4f5 100644
--- a/homeassistant/components/flux_led/light.py
+++ b/homeassistant/components/flux_led/light.py
@@ -214,6 +214,9 @@ async def async_setup_platform(
             host,
         )
         custom_effects = device_config.get(CONF_CUSTOM_EFFECT, {})
+        custom_effect_colors = None
+        if CONF_COLORS in custom_effects:
+            custom_effect_colors = str(custom_effects[CONF_COLORS])
         hass.async_create_task(
             hass.config_entries.flow.async_init(
                 DOMAIN,
@@ -224,7 +227,7 @@ async def async_setup_platform(
                     CONF_NAME: device_config[CONF_NAME],
                     CONF_PROTOCOL: device_config.get(CONF_PROTOCOL),
                     CONF_MODE: device_config.get(ATTR_MODE, MODE_AUTO),
-                    CONF_CUSTOM_EFFECT_COLORS: str(custom_effects.get(CONF_COLORS)),
+                    CONF_CUSTOM_EFFECT_COLORS: custom_effect_colors,
                     CONF_CUSTOM_EFFECT_SPEED_PCT: custom_effects.get(
                         CONF_SPEED_PCT, DEFAULT_EFFECT_SPEED
                     ),
diff --git a/tests/components/flux_led/test_light.py b/tests/components/flux_led/test_light.py
index afca4956055..a3f381b0c1d 100644
--- a/tests/components/flux_led/test_light.py
+++ b/tests/components/flux_led/test_light.py
@@ -741,18 +741,23 @@ async def test_rgb_light_custom_effects(hass: HomeAssistant) -> None:
     assert attributes[ATTR_EFFECT] == "custom"
 
 
-async def test_rgb_light_custom_effects_invalid_colors(hass: HomeAssistant) -> None:
+@pytest.mark.parametrize("effect_colors", [":: CANNOT BE PARSED ::", None])
+async def test_rgb_light_custom_effects_invalid_colors(
+    hass: HomeAssistant, effect_colors: str
+) -> None:
     """Test an rgb light with a invalid effect."""
+    options = {
+        CONF_MODE: MODE_AUTO,
+        CONF_CUSTOM_EFFECT_SPEED_PCT: 88,
+        CONF_CUSTOM_EFFECT_TRANSITION: TRANSITION_JUMP,
+    }
+    if effect_colors:
+        options[CONF_CUSTOM_EFFECT_COLORS] = effect_colors
     config_entry = MockConfigEntry(
         domain=DOMAIN,
         data={CONF_HOST: IP_ADDRESS, CONF_NAME: DEFAULT_ENTRY_TITLE},
+        options=options,
         unique_id=MAC_ADDRESS,
-        options={
-            CONF_MODE: MODE_AUTO,
-            CONF_CUSTOM_EFFECT_COLORS: ":: CANNOT BE PARSED ::",
-            CONF_CUSTOM_EFFECT_SPEED_PCT: 88,
-            CONF_CUSTOM_EFFECT_TRANSITION: TRANSITION_JUMP,
-        },
     )
     config_entry.add_to_hass(hass)
     bulb = _mocked_bulb()
@@ -827,7 +832,7 @@ async def test_rgb_light_custom_effect_via_service(
     bulb.async_set_custom_pattern.reset_mock()
 
 
-async def test_migrate_from_yaml(hass: HomeAssistant) -> None:
+async def test_migrate_from_yaml_with_custom_effect(hass: HomeAssistant) -> None:
     """Test migrate from yaml."""
     config = {
         LIGHT_DOMAIN: [
@@ -876,6 +881,50 @@ async def test_migrate_from_yaml(hass: HomeAssistant) -> None:
     }
 
 
+async def test_migrate_from_yaml_no_custom_effect(hass: HomeAssistant) -> None:
+    """Test migrate from yaml."""
+    config = {
+        LIGHT_DOMAIN: [
+            {
+                CONF_PLATFORM: DOMAIN,
+                CONF_DEVICES: {
+                    IP_ADDRESS: {
+                        CONF_NAME: "flux_lamppost",
+                        CONF_PROTOCOL: "ledenet",
+                    }
+                },
+            }
+        ],
+    }
+    with _patch_discovery(), _patch_wifibulb():
+        await async_setup_component(hass, LIGHT_DOMAIN, config)
+        await hass.async_block_till_done()
+        await hass.async_block_till_done()
+        await hass.async_block_till_done()
+
+    entries = hass.config_entries.async_entries(DOMAIN)
+    assert entries
+
+    migrated_entry = None
+    for entry in entries:
+        if entry.unique_id == MAC_ADDRESS:
+            migrated_entry = entry
+            break
+
+    assert migrated_entry is not None
+    assert migrated_entry.data == {
+        CONF_HOST: IP_ADDRESS,
+        CONF_NAME: "flux_lamppost",
+        CONF_PROTOCOL: "ledenet",
+    }
+    assert migrated_entry.options == {
+        CONF_MODE: "auto",
+        CONF_CUSTOM_EFFECT_COLORS: None,
+        CONF_CUSTOM_EFFECT_SPEED_PCT: 50,
+        CONF_CUSTOM_EFFECT_TRANSITION: "gradual",
+    }
+
+
 async def test_addressable_light(hass: HomeAssistant) -> None:
     """Test an addressable light."""
     config_entry = MockConfigEntry(