diff --git a/Runtime/UXComponent/Navigation/UXNavigationRuntime.cs b/Runtime/UXComponent/Navigation/UXNavigationRuntime.cs
index d12869d..3f764d8 100644
--- a/Runtime/UXComponent/Navigation/UXNavigationRuntime.cs
+++ b/Runtime/UXComponent/Navigation/UXNavigationRuntime.cs
@@ -26,6 +26,7 @@ namespace UnityEngine.UI
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
         private static void Bootstrap()
         {
+            if (AppServices.App == null || AppServices.App.Require<IUIService>() == null) return;
             EnsureInstance();
             UXInputModeService.EnsureInstance();
         }
@@ -348,10 +349,10 @@ namespace UnityEngine.UI
                 }
 
                 bool suppress = IsScopeAvailable(scope)
-                    && _topScope != null
-                    && !ReferenceEquals(scope, _topScope)
-                    && _topScope.BlockLowerScopes
-                    && CompareScopePriority(_topScope, scope) < 0;
+                                && _topScope != null
+                                && !ReferenceEquals(scope, _topScope)
+                                && _topScope.BlockLowerScopes
+                                && CompareScopePriority(_topScope, scope) < 0;
                 scope.SetNavigationSuppressed(suppress);
             }
         }