From 2aff85c4e2e903f9962899288dce92d27fda2a4c Mon Sep 17 00:00:00 2001
From: NaBian <836904362@qq.com>
Date: Mon, 28 Jun 2021 23:00:29 +0800
Subject: [PATCH] fixed #882

---
 .../HandyControl_Shared/Controls/TabControl/TabItem.cs      | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Shared/HandyControl_Shared/Controls/TabControl/TabItem.cs b/src/Shared/HandyControl_Shared/Controls/TabControl/TabItem.cs
index 2ca7248ff..68895a1b0 100644
--- a/src/Shared/HandyControl_Shared/Controls/TabControl/TabItem.cs
+++ b/src/Shared/HandyControl_Shared/Controls/TabControl/TabItem.cs
@@ -225,7 +225,11 @@ public ContextMenu Menu
         /// <param name="oldIndex"></param>
         private void UpdateItemOffsetX(int oldIndex)
         {
-            if (!_isDragging) return;
+            if (!_isDragging || CurrentIndex >= TabPanel.ItemDic.Count)
+            {
+                return;
+            }
+
             var moveItem = TabPanel.ItemDic[CurrentIndex];
             moveItem.CurrentIndex -= CurrentIndex - oldIndex;
             var offsetX = moveItem.TargetOffsetX;