java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.ethereum.trie.TrieImpl.delete(TrieImpl.java:298)
at org.ethereum.trie.TrieImpl.insertOrDelete(TrieImpl.java:215)
at org.ethereum.trie.TrieImpl.update(TrieImpl.java:145)
at org.ethereum.trie.SecureTrie.update(SecureTrie.java:25)
at org.ethereum.trie.SecureTrie.delete(SecureTrie.java:30)
at org.ethereum.db.ContractDetailsImpl.put(ContractDetailsImpl.java:75)
at org.ethereum.db.ContractDetailsCacheImpl.commit(ContractDetailsCacheImpl.java:163)
at org.ethereum.db.RepositoryTrack.commit(RepositoryTrack.java:339)
at org.ethereum.core.BlockchainImpl.applyBlock(BlockchainImpl.java:830)
at org.ethereum.core.BlockchainImpl.processBlock(BlockchainImpl.java:797)
at org.ethereum.core.BlockchainImpl.add(BlockchainImpl.java:523)
at org.ethereum.core.BlockchainImpl.tryToConnect(BlockchainImpl.java:405)
at org.ethereum.sync.SyncManager.produceQueue(SyncManager.java:238)
at org.ethereum.sync.SyncManager.access$200(SyncManager.java:35)
at org.ethereum.sync.SyncManager$4$1.run(SyncManager.java:130)
at java.lang.Thread.run(Thread.java:745)

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