panic: runtime error: slice bounds out of range | github.com/btcsuite/btcd/txscript.GetWitnessSigOpCount

[acoutts]

Running v0.20.1-beta, had 20 days of uptime without any issues. Just experienced this crash. Here is the stack trace:

panic: runtime error: slice bounds out of range [1:0]

goroutine 49 [running]:
github.com/btcsuite/btcd/txscript.GetWitnessSigOpCount(0x401823b5c0, 0x0, 0x0, 0x4014110ce8, 0x17, 0x17, 0x0, 0x0, 0x0, 0x51e00b324258a92a)
        /media/ext/bitcoinhome/btcd/source/txscript/script.go:812 +0x208
github.com/btcsuite/btcd/blockchain.GetSigOpCost(0x401564ef60, 0x401564f000, 0x401564f020, 0x101, 0xa78, 0x0, 0x0)
        /media/ext/bitcoinhome/btcd/source/blockchain/weight.go:111 +0xcc
github.com/btcsuite/btcd/mempool.(*TxPool).maybeAcceptTransaction(0x4009ba41e0, 0x401564ef60, 0x10101, 0x400a47aa00, 0x1, 0x1, 0x4014bd3d08, 0x44d640, 0x4014bd3cf8)
        /media/ext/bitcoinhome/btcd/source/mempool/mempool.go:1118 +0x8c8
github.com/btcsuite/btcd/mempool.(*TxPool).ProcessTransaction(0x4009ba41e0, 0x401564ef60, 0x4018230101, 0x3d114, 0x0, 0x0, 0x0, 0x0, 0x0)
        /media/ext/bitcoinhome/btcd/source/mempool/mempool.go:1375 +0x134
github.com/btcsuite/btcd/netsync.(*SyncManager).handleTxMsg(0x4006f88180, 0x400fc02180)
        /media/ext/bitcoinhome/btcd/source/netsync/manager.go:569 +0x1ac
github.com/btcsuite/btcd/netsync.(*SyncManager).blockHandler(0x4006f88180)
        /media/ext/bitcoinhome/btcd/source/netsync/manager.go:1285 +0x44c
created by github.com/btcsuite/btcd/netsync.(*SyncManager).Start
        /media/ext/bitcoinhome/btcd/source/netsync/manager.go:1514 +0xf8

[prabal-banerjee]

Any known solution to this?

I'm trying to spend from a multisig account. When I sign the transactions with redeem script given to SignRawTransaction3, I get native witness program cannot also have a signature script error.

When I use empty string in place of the redeem script, I encounter this panic error and btcd crashes. Workarounds?