debug_storageRangeAt doesn't work

[impactdni2]

Describe the bug
The debug_storageRangeAt method doesn't work in the current implementation.

To Reproduce
Choose any block/address/start params, all of them fail from what I can tell.
curl https://your_node_here/ -X POST -H "Content-Type: application/json" --data '{"method":"debug_storageRangeAt","params":["0xd5a624c",0,"0xaf88d065e77c8cc2239327c5edb3a432268e5831","0x0000000000000000000000000000000000000000000000000000000000000001",1],"id":1,"jsonrpc":"2.0"}'

Expected behavior
I expect the API to provide the range of storage slots requested

Additional context
Stacktrace of the failure (v2.3.4)

github.com/ethereum/go-ethereum/rpc.(*callback).call.func1()
        /workspace/go-ethereum/rpc/service.go:207 +0x89
panic({0x40dbe00, 0x69e27a0})
        /usr/local/go/src/runtime/panic.go:884 +0x213
github.com/ethereum/go-ethereum/eth.(*EthAPIBackend).BlockByNumber(0x0, {0x4?, 0x0?}, 0x30?)
        /workspace/go-ethereum/eth/api_backend.go:146 +0x12d
github.com/ethereum/go-ethereum/eth.(*EthAPIBackend).BlockByNumberOrHash(0xc0dab16270?, {0x4fc1228?, 0xc0ff119f90?}, {0xc143ec4620, 0x0, 0x0})
        /workspace/go-ethereum/eth/api_backend.go:166 +0x315
github.com/ethereum/go-ethereum/eth.(*DebugAPI).StorageRangeAt(0xc015efc110, {0x4fc1228, 0xc0ff119f90}, {0xc143ec4620, 0x0, 0x0}, 0x4?, {0xaf, 0x88, 0xd0, ...}, ...)
        /workspace/go-ethereum/eth/api_debug.go:226 +0xbd
reflect.Value.call({0xc019d08800?, 0xc019d03890?, 0x7fd6b77573c8?}, {0x458c42b, 0x4}, {0xc0fdd5d6b0, 0x7, 0x0?})
        /usr/local/go/src/reflect/value.go:586 +0xb07
reflect.Value.Call({0xc019d08800?, 0xc019d03890?, 0x16?}, {0xc0fdd5d6b0?, 0x5?, 0x5?})
        /usr/local/go/src/reflect/value.go:370 +0xbc
github.com/ethereum/go-ethereum/rpc.(*callback).call(0xc019eee180, {0x4fc1228?, 0xc0ff119f90}, {0xc0fdd3baa0, 0x14}, {0xc0e9fc1b00, 0x5, 0x15e3497?})
        /workspace/go-ethereum/rpc/service.go:213 +0x3c5
github.com/ethereum/go-ethereum/rpc.(*handler).runMethod(0xc0f6ac7b90?, {0x4fc1228?, 0xc0ff119f90?}, 0xc0e5ce7b20, 0x5?, {0xc0e9fc1b00?, 0x155e28b?, 0x6f5df38?})
        /workspace/go-ethereum/rpc/handler.go:565 +0x45
github.com/ethereum/go-ethereum/rpc.(*handler).handleCall(0xc11392d540, 0xc0dab16180, 0xc0e5ce7b20)
        /workspace/go-ethereum/rpc/handler.go:512 +0x239
github.com/ethereum/go-ethereum/rpc.(*handler).handleCallMsg(0xc11392d540, 0xc0dab16210?, 0xc0e5ce7b20)
        /workspace/go-ethereum/rpc/handler.go:470 +0x237
github.com/ethereum/go-ethereum/rpc.(*handler).handleNonBatchCall(0xc11392d540, 0xc0dab16180, 0xc0e5ce7b20)
        /workspace/go-ethereum/rpc/handler.go:296 +0x1ae
github.com/ethereum/go-ethereum/rpc.(*handler).handleMsg.func1.1(0x4fc1228?)
        /workspace/go-ethereum/rpc/handler.go:269 +0x27
github.com/ethereum/go-ethereum/rpc.(*handler).startCallProc.func1()
        /workspace/go-ethereum/rpc/handler.go:387 +0xc5
created by github.com/ethereum/go-ethereum/rpc.(*handler).startCallProc
        /workspace/go-ethereum/rpc/handler.go:383 +0x8d

WARN [06-21|13:42:19.232] Served debug_storageRangeAt              conn=xxx.xxx.xxx.xxx:58866 reqid=1 duration="210.355µs" err="method handler crashed"