Node has been running for 2 days

tail -n 100 algod-err.log
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xb559d460]

goroutine 1 [running]:
runtime/internal/atomic.goLoad64(0x850712ac, 0x852618e4, 0x85071201)
runtime/internal/atomic/atomic_arm.go:131 +0x1c
github.com/algorand/go-algorand/crypto/merklearray.(*workerState).nextWorker(0x85071290, 0x8526190c)
github.com/algorand/go-algorand/crypto/merklearray/worker.go:90 +0x44
github.com/algorand/go-algorand/crypto/merklearray.Build(0xb680a3f8, 0x8976c580, 0x40, 0x0, 0x5f767a0)
github.com/algorand/go-algorand/crypto/merklearray/merkle.go:75 +0x158
github.com/algorand/go-algorand/data/bookkeeping.Block.TxnMerkleTree(...)
github.com/algorand/go-algorand/data/bookkeeping/txn_merkle.go:34
github.com/algorand/go-algorand/data/bookkeeping.Block.paysetCommit(0xcc9e54, 0x0, 0x90e60256, 0xa8db0b53, 0xc9d9a9a6, 0x226ca5aa, 0xca258862, 0xe06b8443, 0xd5cf287c, 0xdf24a63c, …)
github.com/algorand/go-algorand/data/bookkeeping/block.go:500 +0x154
github.com/algorand/go-algorand/data/bookkeeping.Block.PaysetCommit(0xcc9e54, 0x0, 0x90e60256, 0xa8db0b53, 0xc9d9a9a6, 0x226ca5aa, 0xca258862, 0xe06b8443, 0xd5cf287c, 0xdf24a63c, …)
github.com/algorand/go-algorand/data/bookkeeping/block.go:492 +0xac
github.com/algorand/go-algorand/data/bookkeeping.MakeBlock(0xcc9e53, 0x0, 0xadd3ee81, 0x2ee71957, 0xb7eaef9, 0xe59ab55c, 0x3744ff48, 0xc8fdfd18, 0xe1428d9a, 0xf42fe4e2, …)
github.com/algorand/go-algorand/data/bookkeeping/block.go:477 +0x3d0
github.com/algorand/go-algorand/data/pools.(*TransactionPool).recomputeBlockEvaluator(0x851be6c0, 0x852645d4, 0x0, 0x85196540, 0x59, 0x0, 0x0)
github.com/algorand/go-algorand/data/pools/transactionPool.go:666 +0x338
github.com/algorand/go-algorand/data/pools.MakeTransactionPool(0x8582a000, 0x0, 0x0, 0x4, 0x0, 0x0, 0xf8475800, 0xd, 0x0, 0x0, …)
github.com/algorand/go-algorand/data/pools/transactionPool.go:112 +0x250
github.com/algorand/go-algorand/node.MakeFull(0xb6818768, 0x850107d0, 0x8502b060, 0x12, 0x0, 0x0, 0x4, 0x0, 0x0, 0xf8475800, …)
github.com/algorand/go-algorand/node/node.go:208 +0xbe8
github.com/algorand/go-algorand/daemon/algod.(*Server).Initialize(0x85265db4, 0x0, 0x0, 0x4, 0x0, 0x0, 0xf8475800, 0xd, 0x0, 0x0, …)
github.com/algorand/go-algorand/daemon/algod/server.go:127 +0x5b4
main.main()
github.com/algorand/go-algorand/cmd/algod/main.go:292 +0xd8c