diff --git a/homeassistant/components/harmony/config_flow.py b/homeassistant/components/harmony/config_flow.py
index 9142eed2dba..6d5adabe235 100644
--- a/homeassistant/components/harmony/config_flow.py
+++ b/homeassistant/components/harmony/config_flow.py
@@ -164,6 +164,9 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
     def _host_already_configured(self, host):
         """See if we already have a harmony entry matching the host."""
         for entry in self._async_current_entries():
+            if CONF_HOST not in entry.data:
+                continue
+
             if entry.data[CONF_HOST] == host:
                 return True
         return False
diff --git a/tests/components/harmony/test_config_flow.py b/tests/components/harmony/test_config_flow.py
index d159a0f025f..acf1ffd16f1 100644
--- a/tests/components/harmony/test_config_flow.py
+++ b/tests/components/harmony/test_config_flow.py
@@ -153,6 +153,9 @@ async def test_form_ssdp_aborts_before_checking_remoteid_if_host_known(hass):
     )
     config_entry.add_to_hass(hass)
 
+    config_entry_without_host = MockConfigEntry(domain=DOMAIN, data={"name": "other"},)
+    config_entry_without_host.add_to_hass(hass)
+
     harmonyapi = _get_mock_harmonyapi(connect=True)
 
     with patch(