diff --git a/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2022OrNewer.cs b/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2022OrNewer.cs
index e936332..084e388 100644
--- a/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2022OrNewer.cs
+++ b/Editor/BuildProcessors/AddLil2cppSourceCodeToXcodeproj2022OrNewer.cs
@@ -2,6 +2,7 @@ using HybridCLR.Editor.Installer;
 using HybridCLR.Editor.Settings;
 using System.IO;
 using System.Text;
+using System.Text.RegularExpressions;
 using UnityEditor;
 using UnityEditor.Build;
 using UnityEditor.Callbacks;
@@ -24,6 +25,31 @@ namespace HybridCLR.Editor.BuildProcessors
             CopyLibil2cppToXcodeProj(pathToBuiltProject);
         }
 
+        private static string TryRemoveDunplicateShellScriptSegment(string pbxprojFile, string pbxprojContent)
+        {
+            // will appear duplicated Shell Script segment when append to existed xcode project.
+            // This is unity bug.
+            // we remove duplicated Shell Script to avoid build error.
+            string copyFileComment = @"/\* CopyFiles \*/,\s+([A-Z0-9]{24}) /\* ShellScript \*/,\s+([A-Z0-9]{24}) /\* ShellScript \*/,";
+            var m = Regex.Match(pbxprojContent, copyFileComment, RegexOptions.Multiline);
+            if (!m.Success)
+            {
+                return pbxprojContent;
+            }
+
+            if (m.Groups[1].Value != m.Groups[2].Value)
+            {
+                throw new BuildFailedException($"find invalid /* ShellScript */ segment");
+            }
+
+            int startIndexOfDupShellScript = m.Groups[2].Index;
+            int endIndexOfDupShellScript = pbxprojContent.IndexOf(",", startIndexOfDupShellScript);
+
+            pbxprojContent = pbxprojContent.Remove(startIndexOfDupShellScript, endIndexOfDupShellScript + 1 - startIndexOfDupShellScript);
+            Debug.LogWarning($"[AddLil2cppSourceCodeToXcodeproj] remove duplicated '/* ShellScript */' from file '{pbxprojFile}'");
+            return pbxprojContent;
+        }
+
         private static void RemoveExternalLibil2cppOption(string pbxprojFile)
         {
             string pbxprojContent = File.ReadAllText(pbxprojFile, Encoding.UTF8);
@@ -38,13 +64,8 @@ namespace HybridCLR.Editor.BuildProcessors
                 Debug.LogWarning($"[AddLil2cppSourceCodeToXcodeproj] project.pbxproj remove building option:'{removeBuildOption}' fail. This may occur when 'Append' to existing xcode project in building");
             }
 
-            int strShellScriptIndex1 = pbxprojContent.IndexOf("/* ShellScript */,");
-            int strShellScriptIndex2 = pbxprojContent.IndexOf("/* ShellScript */,", strShellScriptIndex1 + 10);
-            if (strShellScriptIndex2 >= 0)
-            {
-                pbxprojContent = pbxprojContent.Remove(strShellScriptIndex1, strShellScriptIndex2 - strShellScriptIndex1);
-                Debug.LogWarning($"[AddLil2cppSourceCodeToXcodeproj] remove duplicated '/* ShellScript */' from file '{pbxprojFile}'");
-            }
+            pbxprojContent = TryRemoveDunplicateShellScriptSegment(pbxprojFile, pbxprojContent);
+
 
             File.WriteAllText(pbxprojFile, pbxprojContent, Encoding.UTF8);
         }