java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at org.ethereum.trie.TrieImpl.delete(
at org.ethereum.trie.TrieImpl.insertOrDelete(
at org.ethereum.trie.TrieImpl.update(
at org.ethereum.trie.SecureTrie.update(
at org.ethereum.trie.SecureTrie.delete(
at org.ethereum.db.ContractDetailsImpl.put(
at org.ethereum.db.ContractDetailsCacheImpl.commit(
at org.ethereum.db.RepositoryTrack.commit(
at org.ethereum.core.BlockchainImpl.applyBlock(
at org.ethereum.core.BlockchainImpl.processBlock(
at org.ethereum.core.BlockchainImpl.add(
at org.ethereum.core.BlockchainImpl.tryToConnect(
at org.ethereum.sync.SyncManager.produceQueue(
at org.ethereum.sync.SyncManager.access$200(
at org.ethereum.sync.SyncManager$4$

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