1

Src/Core/Extensions/Task.cs

@@ -59,6 +59,7 @@ namespace BITKit
 
         public static async UniTask UniTaskFunc<T0,T1,T2>(this Func<T0,T1,T2,UniTask> self,T0 arg0,T1 arg1,T2 arg2)
         {
+            if(self is null)return;
             List<UniTask> tasks = new List<UniTask>();
             foreach (var func in self.CastAsFunc())
             {

Src/Core/Group/ActivableGroup.cs

@@ -100,6 +100,10 @@ namespace BITKit
                         {
                             return;
                         }
+                        catch (Exception e)
+                        {
+                            BIT4Log.LogException(e);
+                        }
                         currentElement.IsEntered = false;
                         OnExit?.Invoke(currentElement);
                     }

Src/Unity/Scripts/UX/Service/UI Toolkit/UIToolKitPanel.cs

@@ -149,12 +149,13 @@ namespace BITKit.UX
 	        }
 	        isActive = true;
 		}
-         async UniTask IEntryElement.EntryAsync()
+        public virtual async UniTask EntryAsync()
         {
 	        if (entryDuration.Allow is false) return;
 	        while (CurrentOpacity < 1 && TargetOpacity is 1)
 	        {
 		        await UniTask.NextFrame(cancellationToken);
+		        if(destroyCancellationToken.IsCancellationRequested)return;
 	        }
         }
         void IEntryElement.Entered()

Src/Unity/Scripts/Utility/Extensions.cs

@@ -603,6 +603,7 @@ namespace BITKit
             self.SetActive(visibleOnEmpty || result);
             return result;
         }
+        public static T Get<T>(this VisualElement self ,int index = 0) where T : VisualElement => self.Q<T>($"{typeof(T).Name}--{index}");
         public static T Create<T>(this VisualElement self, string name = Constant.EmetyString) where T : VisualElement, new()
         {
             var element = new T();