[NullReferenceException: 未将对象引用设置到对象的实例。]
Roadkill.Core.Managers.HistoryManager.CompareVersions(Guid mainVersionId) in c:\Projects\roadkill\src\Roadkill.Core\Domain\Managers\HistoryManager.cs:79
Roadkill.Core.Mvc.Controllers.PagesController.Version(Guid id) in c:\Projects\roadkill\src\Roadkill.Core\MVC\Controllers\PagesController.cs:261
lambda_method(Closure , ControllerBase , Object[] ) +161
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +279
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +34
System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +79
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +452
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +660
System.Web.Mvc.Controller.ExecuteCore() +143
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +91
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +57
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +22
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +36
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +393
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +128
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