diff --git a/homeassistant/components/mobile_app/webhook.py b/homeassistant/components/mobile_app/webhook.py
index b278401d864..610173ca337 100644
--- a/homeassistant/components/mobile_app/webhook.py
+++ b/homeassistant/components/mobile_app/webhook.py
@@ -352,7 +352,9 @@ async def webhook_enable_encryption(hass, config_entry, data):
         vol.Required(ATTR_SENSOR_TYPE): vol.In(SENSOR_TYPES),
         vol.Required(ATTR_SENSOR_UNIQUE_ID): cv.string,
         vol.Optional(ATTR_SENSOR_UOM): cv.string,
-        vol.Required(ATTR_SENSOR_STATE): vol.Any(None, bool, str, int, float),
+        vol.Optional(ATTR_SENSOR_STATE, default=None): vol.Any(
+            None, bool, str, int, float
+        ),
         vol.Optional(ATTR_SENSOR_ICON, default="mdi:cellphone"): cv.icon,
     }
 )
diff --git a/homeassistant/const.py b/homeassistant/const.py
index e51ff95e97d..7517217f7d2 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -1,7 +1,7 @@
 """Constants used by Home Assistant components."""
 MAJOR_VERSION = 0
 MINOR_VERSION = 110
-PATCH_VERSION = "6"
+PATCH_VERSION = "7"
 __short_version__ = f"{MAJOR_VERSION}.{MINOR_VERSION}"
 __version__ = f"{__short_version__}.{PATCH_VERSION}"
 REQUIRED_PYTHON_VER = (3, 7, 0)
diff --git a/tests/components/mobile_app/test_entity.py b/tests/components/mobile_app/test_entity.py
index 9f91e659fb0..5dc9717ce36 100644
--- a/tests/components/mobile_app/test_entity.py
+++ b/tests/components/mobile_app/test_entity.py
@@ -161,6 +161,31 @@ async def test_register_sensor_no_state(hass, create_registrations, webhook_clie
     assert entity.name == "Test 1 Battery State"
     assert entity.state == STATE_UNKNOWN
 
+    reg_resp = await webhook_client.post(
+        webhook_url,
+        json={
+            "type": "register_sensor",
+            "data": {
+                "name": "Backup Battery State",
+                "type": "sensor",
+                "unique_id": "backup_battery_state",
+            },
+        },
+    )
+
+    assert reg_resp.status == 201
+
+    json = await reg_resp.json()
+    assert json == {"success": True}
+    await hass.async_block_till_done()
+
+    entity = hass.states.get("sensor.test_1_backup_battery_state")
+    assert entity
+
+    assert entity.domain == "sensor"
+    assert entity.name == "Test 1 Backup Battery State"
+    assert entity.state == STATE_UNKNOWN
+
 
 async def test_update_sensor_no_state(hass, create_registrations, webhook_client):
     """Test that sensors can be updated, when there is no (unknown) state."""