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Exception when copying card

See original GitHub issue

Just got this on my production system after doing the upgrade today:

System.ArgumentNullException: Value cannot be null.
Parameter name: key
   at System.Collections.Concurrent.ConcurrentDictionary`2.TryGetValue(TKey key, TValue& value)
   at Manatee.Trello.Internal.Caching.ConcurrentCache.Find[T](String id)
   at Manatee.Trello.Internal.Caching.CachingObjectFactory.GetFromCache[T](IJsonCacheable json, TrelloAuthorization auth)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)
   at Manatee.Trello.ReadOnlyCollection`1.Update(IEnumerable`1 items)
   at Manatee.Trello.Internal.Synchronization.AttachmentContext.MergeDependencies(IJsonAttachment json)
   at Manatee.Trello.Internal.Synchronization.SynchronizationContext`1.Merge(TJson json, Boolean overwrite)
   at Manatee.Trello.Internal.Synchronization.CardContext.<MergeDependencies>b__47_1(IJsonAttachment a)
   at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
   at System.Collections.Generic.List`1.InsertRange(Int32 index, IEnumerable`1 collection)
   at Manatee.Trello.ReadOnlyCollection`1.Update(IEnumerable`1 items)
   at Manatee.Trello.Internal.Synchronization.CardContext.MergeDependencies(IJsonCard json)
   at Manatee.Trello.Internal.Synchronization.SynchronizationContext`1.Merge(TJson json, Boolean overwrite)
   at Manatee.Trello.CardCollection.<CreateCard>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Manatee.Trello.CardCollection.<Add>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Ops.Features.Trello.Handler.<Handle>d__4.MoveNext() in C:\BuildAgent\work\d8126f682f27008b\source\Ops\Features\Trello\Handler.cs:line 46

Handler.cs:line 46 contains:

var board = _trello.Board("some board ID");
await board.Lists.Refresh();
var list = board.Lists["some list ID"];
var cards = list.Cards;
card = await cards.Add(_trello.Card("some template card ID")); // line 46

The error is persistent, i.e. doesn’t go away when the request is repeated by the system. On Trello web I can see the template card being copied, but no modifications were made to them. (Modifications happen after line 46.)