diff --git a/lib/pages/space_tree/view/custom_expansion.dart b/lib/pages/space_tree/view/custom_expansion.dart
index 43087e05..e4e7f423 100644
--- a/lib/pages/space_tree/view/custom_expansion.dart
+++ b/lib/pages/space_tree/view/custom_expansion.dart
@@ -31,15 +31,11 @@ class CustomExpansionTileSpaceTree extends StatelessWidget {
           children: [
             Checkbox(
               value: isSoldCheck ? null : isSelected,
-              onChanged: (bool? value) {
-                if (onItemSelected != null) {
-                  onItemSelected!();
-                }
-              },
+              onChanged: (value) => onItemSelected ?? () {},
               tristate: true,
-              side: WidgetStateBorderSide.resolveWith((states) {
-                return const BorderSide(color: ColorsManager.grayBorder);
-              }),
+              side: WidgetStateBorderSide.resolveWith(
+                (states) => const BorderSide(color: ColorsManager.grayBorder),
+              ),
               fillColor: WidgetStateProperty.resolveWith((states) {
                 if (states.contains(WidgetState.selected)) {
                   return ColorsManager.blue1;