Fix pointer style crash during early theme changes

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- Fixed a crash when applying `pointer` styles while changing theme before the screen stack is ready https://github.com/Textualize/textual/issues/6360
+
 ## [8.2.8] - 2026-06-30
 
 ### Fixed

src/textual/css/_style_properties.py

@@ -877,11 +877,12 @@ def __set__(self, obj: StylesBase, value: EnumType | None = None):
                     parent=self._refresh_parent,
                 )
                 if self._pointer and obj.node is not None:
+                    from textual.app import ScreenStackError
                     from textual.dom import NoScreen
 
                     try:
                         obj.node.screen.update_pointer_shape()
-                    except NoScreen:
+                    except (NoScreen, ScreenStackError):
                         pass
 
 

tests/test_app.py

@@ -405,6 +405,25 @@ def compose(self) -> ComposeResult:
         assert app.screen._pointer_shape == "pointer"
 
 
+async def test_app_pointer_style_with_theme_before_screen_stack() -> None:
+    """Regression test for https://github.com/Textualize/textual/issues/6360."""
+
+    class PointerThemeApp(App[None]):
+        CSS = """
+        * {
+            pointer: default;
+        }
+        """
+
+        def __init__(self) -> None:
+            super().__init__()
+            self.theme = "textual-light"
+
+    app = PointerThemeApp()
+    async with app.run_test():
+        assert app.theme == "textual-light"
+
+
 async def test_get_screen_stack() -> None:
     """Test get_screen_stack"""