Unity集成Fabric/Crashlytics失败：导入Crashlytics时崩溃报错

我之前也踩过Fabric 1.2.8和Unity兼容的这个坑，给你几个亲测有效的解决办法：

先还原下问题场景：导入Fabric最新1.2.8版本后，能正常登录、选择组织并勾选Crashlytics导入，但下载完成后Unity要么直接崩溃，要么Fabric窗口卡死，同时抛出两类错误：

错误1：SynchronizationLockException #

SynchronizationLockException: Object synchronization method was called from an unsynchronized block of code. 
Fabric.Internal.Editor.Update.Dependency.DependencyGraphManager.Continue () (at Assets/Fabric/Editor/Update/Dependency/DependencyGraphManager.cs:44) 
Fabric.Internal.Editor.Update.PeriodicUpdateManager.Continue () (at Assets/Fabric/Editor/Update/PeriodicUpdateManager.cs:105) 
Fabric.Internal.Editor.Controller.PluginController.CleanKitUpgrade (System.String name) (at Assets/Fabric/Editor/GUI/Controller/PluginController.cs:403) 
Fabric.Internal.Editor.Controller.PluginController.PageFromState () (at Assets/Fabric/Editor/GUI/Controller/PluginController.cs:468) 
Fabric.Internal.Editor.Editor.OnGUI () (at Assets/Fabric/Editor/GUI/Editor.cs:52) 
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:305) 
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation. 
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:313) 
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:295) 
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:295) 
UnityEditor.HostView.Invoke (System.String methodName) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:288) 
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:261) 
UnityEditor.DockArea.OldOnGUI () (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:398) 
UnityEngine.Experimental.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt) (at /Users/builduser/buildslave/unity/build/Runtime/UIElements/Managed/IMGUIContainer.cs:182) 
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

错误2：NullReferenceException #

NullReferenceException: Object reference not set to an instance of an object 
Fabric.Internal.Editor.Editor.OnGUI () (at Assets/Fabric/Editor/GUI/Editor.cs:54) 
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:305) 
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation. 
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Reflection/MonoMethod.cs:313) 
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:295) 
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:295) 
UnityEditor.HostView.Invoke (System.String methodName) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:288) 
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition) (at /Users/builduser/buildslave/unity/build/Editor/Mono/HostView.cs:261) 
UnityEditor.DockArea.OldOnGUI () (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/DockArea.cs:398) 
UnityEngine.Experimental.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt) (at /Users/builduser/buildslave/unity/build/Runtime/UIElements/Managed/IMGUIContainer.cs:198) 
UnityEngine.Experimental.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e) (at /Users/builduser/buildslave/unity/build/Runtime/UIElements/Managed/IMGUIContainer.cs:338) 
UnityEngine.Experimental.UIElements.IMGUIContainer.DoRepaint (UnityEngine.IStylePainter painter) (at /Users/builduser/buildslave/unity/build/Runtime/UIElements/Managed/IMGUIContainer.cs:69) 
UnityEngine.Experi

具体解决步骤： #

• 回退到Fabric 1.2.7版本：这是最快捷有效的方案，1.2.8版本的Editor代码存在同步锁逻辑错误，直接用旧版本能完全避开问题。导入前记得删除项目里已有的Assets/Fabric文件夹和Packages中相关的Fabric条目。
• 手动修复Editor代码：如果不想换版本，找到Assets/Fabric/Editor/Update/Dependency/DependencyGraphManager.cs文件，定位到第44行的Continue()方法，修正锁的使用逻辑——原代码大概率是在未持有锁的情况下调用了Monitor.Exit，你可以用lock关键字包裹方法内容，确保锁的获取和释放配对：

  private object _lockObj = new object();
  public void Continue()
  {
      lock(_lockObj)
      {
          // 原方法的业务逻辑代码
      }
  }
  

• 清理Unity缓存：关闭Unity后，删除项目根目录的Library和Temp文件夹，再重新打开项目导入Fabric包，避免缓存冲突导致的异常。
• 禁用自动更新：导入完成后，在Fabric的设置面板里关闭自动更新功能，防止它自动升级回有问题的1.2.8版本。

内容的提问来源于stack exchange，提问作者Adam Sutcliffe