跳蚤市场无法买东西，服务端报错，我搜“注射器”之后就这样了

已安装MOD：

AmandsSense、Fika、mpstark-dynamicmaps、SimpleHitMarker、QuickPriceLite

报错消息如下：

Error handling request: /client/ragfair/find

Object reference not set to an instance of an object.

   at SPTarkov.Server.Core.Services.Ragfair.RagfairCategoriesService.<>c__DisplayClass2_0.<GetCategoriesFromOffers>b__0(RagfairOffer offer)

   at System.Linq.Enumerable.ListWhereIterator`1.MoveNext()

   at System.Linq.Lookup`2.Create(IEnumerable`1 source, Func`2 keySelector, IEqualityComparer`1 comparer)

   at System.Linq.Enumerable.GroupByIterator`2.MoveNext()

   at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)

   at SPTarkov.Server.Core.Services.Ragfair.RagfairCategoriesService.GetCategoriesFromOffers(IEnumerable`1 offers, SearchRequestData searchRequestData, Boolean fleaUnlocked)

   at SPTarkov.Server.Core.Controllers.RagfairController.GetSpecificCategories(PmcData pmcProfile, SearchRequestData searchRequest, List`1 offers)

   at SPTarkov.Server.Core.Controllers.RagfairController.GetOffers(MongoId sessionID, SearchRequestData searchRequest)

   at SPTarkov.Server.Core.Routers.Static.RagfairStaticRouter.<>c__DisplayClass0_0.<<-ctor>b__1>d.MoveNext()

— End of stack trace from previous location —

   at SPTarkov.Server.Core.DI.RouteAction`1.<>c__DisplayClass0_0.<<-ctor>b__0>d.MoveNext()

— End of stack trace from previous location —

   at SPTarkov.Server.Core.DI.StaticRouter.HandleStaticAsync(String url, String body, MongoId sessionId, String output, CancellationToken cancellationToken)

   at SPTarkov.Server.Core.Routers.HttpRouter.HandleRouteAsync(HttpRequest request, MongoId sessionID, ResponseWrapper wrapper, IEnumerable`1 routers, Boolean dynamic, String body, CancellationToken cancellationToken)

   at SPTarkov.Server.Core.Routers.HttpRouter.GetResponseAsync(HttpRequest req, MongoId sessionID, String body, CancellationToken cancellationToken)

   at SPTarkov.Server.Core.Servers.Http.SptHttpListener.GetResponseAsync(MongoId sessionId, HttpContext context, String body, CancellationToken cancellationToken)

   at SPTarkov.Server.Core.Servers.Http.SptHttpListener.HandleAsync(MongoId sessionId, HttpContext context, CancellationToken cancellationToken)

   at SPTarkov.Server.Core.Servers.HttpServer.HandleRequestAsync(HttpContext context, RequestDelegate next, CancellationToken cancellationToken)

   at SPTarkov.Server.Program.<>c.<<ConfigureWebApp>b__4_1>d.MoveNext()

— End of stack trace from previous location —

   at SPTarkov.Server.Middleware.SptLoggerMiddleware.InvokeAsync(HttpContext context)