System.ObjectDisposedException: The CancellationTokenSource has been disposed.

[sentry-io]

Sentry Issue: 9C-STANDALONE-QD

System.ObjectDisposedException: The CancellationTokenSource has been disposed.
  Module "Libplanet.Blockchain.BlockChain`1+<>c__DisplayClass47_0", in <MineBlock>g__WatchTip|0
  Module "Libplanet.Blockchain.BlockChain`1", in Swap
  Module "Libplanet.Net.Swarm`1", in SyncPreviousBlocksAsync
  Module "Libplanet.Net.Swarm`1", in ProcessFillblock
...
(1 additional frame(s) were not displayed)

Unexpected exception occurred during ProcessFillblock: "System.ObjectDisposedException: The CancellationTokenSource has been disposed.
   at System.Threading.CancellationTokenSource.ThrowObjectDisposedException()
   at Libplanet.Blockchain.BlockChain`1.<>c__DisplayClass47_0.<MineBlock>g__WatchTip|0(Object target, TipChangedEventArgs args)
   at Libplanet.Blockchain.BlockChain`1.Swap(BlockChain`1 other, Boolean render)
   at Libplanet.Net.Swarm`1.SyncPreviousBlocksAsync(BlockChain`1 blockChain, BoundPeer peer, Nullable`1 stop, IProgress`1 progress, Int64 totalBlockCount, Boolean evaluateActions, CancellationToken cancellationToken)
   at Libplanet.Net.Swarm`1.ProcessFillblock(CancellationToken cancellationToken)"