diff --git a/homeassistant/components/google_generative_ai_conversation/config_flow.py b/homeassistant/components/google_generative_ai_conversation/config_flow.py
index 2782122feae..4a1a6448ce7 100644
--- a/homeassistant/components/google_generative_ai_conversation/config_flow.py
+++ b/homeassistant/components/google_generative_ai_conversation/config_flow.py
@@ -14,6 +14,7 @@ import voluptuous as vol
 from homeassistant.config_entries import (
     SOURCE_REAUTH,
     ConfigEntry,
+    ConfigEntryState,
     ConfigFlow,
     ConfigFlowResult,
     ConfigSubentryFlow,
@@ -192,6 +193,10 @@ class ConversationSubentryFlowHandler(ConfigSubentryFlow):
         self, user_input: dict[str, Any] | None = None
     ) -> SubentryFlowResult:
         """Set conversation options."""
+        # abort if entry is not loaded
+        if self._get_entry().state != ConfigEntryState.LOADED:
+            return self.async_abort(reason="entry_not_loaded")
+
         errors: dict[str, str] = {}
 
         if user_input is None:
diff --git a/homeassistant/components/google_generative_ai_conversation/strings.json b/homeassistant/components/google_generative_ai_conversation/strings.json
index df3011d399a..e81ee7e9648 100644
--- a/homeassistant/components/google_generative_ai_conversation/strings.json
+++ b/homeassistant/components/google_generative_ai_conversation/strings.json
@@ -54,6 +54,7 @@
         }
       },
       "abort": {
+        "entry_not_loaded": "Cannot add things while the configuration is disabled.",
         "reconfigure_successful": "[%key:common::config_flow::abort::reconfigure_successful%]"
       },
       "error": {
diff --git a/tests/components/google_generative_ai_conversation/test_config_flow.py b/tests/components/google_generative_ai_conversation/test_config_flow.py
index 7202526f405..6d02fbb7686 100644
--- a/tests/components/google_generative_ai_conversation/test_config_flow.py
+++ b/tests/components/google_generative_ai_conversation/test_config_flow.py
@@ -129,8 +129,6 @@ async def test_creating_conversation_subentry(
     mock_config_entry: MockConfigEntry,
 ) -> None:
     """Test creating a conversation subentry."""
-    mock_config_entry.add_to_hass(hass)
-
     with patch(
         "google.genai.models.AsyncModels.list",
         return_value=get_models_pager(),
@@ -163,6 +161,26 @@ async def test_creating_conversation_subentry(
     assert result2["data"] == processed_options
 
 
+async def test_creating_conversation_subentry_not_loaded(
+    hass: HomeAssistant,
+    mock_init_component: None,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test creating a conversation subentry."""
+    await hass.config_entries.async_unload(mock_config_entry.entry_id)
+    with patch(
+        "google.genai.models.AsyncModels.list",
+        return_value=get_models_pager(),
+    ):
+        result = await hass.config_entries.subentries.async_init(
+            (mock_config_entry.entry_id, "conversation"),
+            context={"source": config_entries.SOURCE_USER},
+        )
+
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "entry_not_loaded"
+
+
 def will_options_be_rendered_again(current_options, new_options) -> bool:
     """Determine if options will be rendered again."""
     return current_options.get(CONF_RECOMMENDED) != new_options.get(CONF_RECOMMENDED)