Fix None schema in SchemaCommonFlowHandler (#82699)

homeassistant/helpers/schema_config_entry_flow.py

@@ -139,19 +139,21 @@ class SchemaCommonFlowHandler:
             # User input was validated successfully, update options
             self._options.update(user_input)
 
-        next_step_id: str = step_id
         if user_input is not None or form_step.schema is None:
-            # Get next step
+            return self._show_next_step_or_create_entry(form_step)
+
+        return self._show_next_step(step_id)
+
+    def _show_next_step_or_create_entry(
+        self, form_step: SchemaFlowFormStep
+    ) -> FlowResult:
         if form_step.next_step is None:
             # Flow done, create entry or update config entry options
             return self._handler.async_create_entry(data=self._options)
 
         if isinstance(form_step.next_step, str):
-                next_step_id = form_step.next_step
-            else:
-                next_step_id = form_step.next_step(self._options)
-
-        return self._show_next_step(next_step_id)
+            return self._show_next_step(form_step.next_step)
+        return self._show_next_step(form_step.next_step(self._options))
 
     def _show_next_step(
         self,
@@ -173,7 +175,10 @@ class SchemaCommonFlowHandler:
 
         form_step = cast(SchemaFlowFormStep, self._flow[next_step_id])
 
-        if (data_schema := self._get_schema(form_step)) and data_schema.schema:
+        if (data_schema := self._get_schema(form_step)) is None:
+            return self._show_next_step_or_create_entry(form_step)
+
+        if data_schema.schema:
             # Make a copy of the schema with suggested values set to saved options
             schema = {}
             for key, val in data_schema.schema.items():

tests/helpers/test_schema_config_entry_flow.py

@@ -70,3 +70,34 @@ async def test_menu_step(hass: HomeAssistant) -> None:
 
         result = await hass.config_entries.flow.async_configure(result["flow_id"], {})
         assert result["type"] == FlowResultType.CREATE_ENTRY
+
+
+async def test_schema_none(hass: HomeAssistant) -> None:
+    """Test SchemaFlowFormStep with schema set to None."""
+
+    CONFIG_FLOW: dict[str, SchemaFlowFormStep | SchemaFlowMenuStep] = {
+        "user": SchemaFlowFormStep(next_step="option1"),
+        "option1": SchemaFlowFormStep(vol.Schema({}), next_step="pass"),
+        "pass": SchemaFlowFormStep(next_step="option3"),
+        "option3": SchemaFlowFormStep(vol.Schema({})),
+    }
+
+    class TestConfigFlow(SchemaConfigFlowHandler, domain=TEST_DOMAIN):
+        """Handle a config or options flow for Derivative."""
+
+        config_flow = CONFIG_FLOW
+
+    mock_platform(hass, f"{TEST_DOMAIN}.config_flow")
+    with patch.dict(config_entries.HANDLERS, {TEST_DOMAIN: TestConfigFlow}):
+        result = await hass.config_entries.flow.async_init(
+            TEST_DOMAIN, context={"source": "user"}
+        )
+        assert result["type"] == FlowResultType.FORM
+        assert result["step_id"] == "option1"
+
+        result = await hass.config_entries.flow.async_configure(result["flow_id"], {})
+        assert result["type"] == FlowResultType.FORM
+        assert result["step_id"] == "option3"
+
+        result = await hass.config_entries.flow.async_configure(result["flow_id"], {})
+        assert result["type"] == FlowResultType.CREATE_ENTRY