panic: interface conversion: interface is nil, not roachpb.Request [recovered]
        panic: interface conversion: interface is nil, not roachpb.Request

goroutine 45 [running]:
panic(0x15a5780, 0xc421a466c0)
        /usr/local/go/src/runtime/panic.go:500 +0x1a1
github.com/cockroachdb/cockroach/cli.initBacktrace.func2(0x15a5780, 0xc421a466c0)
        /go/src/github.com/cockroachdb/cockroach/cli/backtrace.go:98 +0xca
github.com/cockroachdb/cockroach/util/stop.(*Stopper).Recover(0xc42040d560)
        /go/src/github.com/cockroachdb/cockroach/util/stop/stopper.go:173 +0x56
panic(0x15a5780, 0xc421a466c0)
        /usr/local/go/src/runtime/panic.go:458 +0x243
github.com/cockroachdb/cockroach/roachpb.RequestUnion.GetInner(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
        /go/src/github.com/cockroachdb/cockroach/roachpb/api.go:325 +0x6f
github.com/cockroachdb/cockroach/roachpb.(*BatchRequest).GetArg(0xc4217a33b8, 0x16, 0xc421dfe540, 0x1, 0x1)
        /go/src/github.com/cockroachdb/cockroach/roachpb/batch.go:139 +0xdd
github.com/cockroachdb/cockroach/roachpb.(*BatchRequest).IsLease(0xc4217a33b8, 0xc4203b9380)
        /go/src/github.com/cockroachdb/cockroach/roachpb/batch.go:78 +0x3e
github.com/cockroachdb/cockroach/storage.(*Replica).processRaftCommand(0xc4203a26c0, 0xc421152970, 0x8, 0x20831, 0x15804, 0x100000001, 0x1, 0x1473ff8ab84d635e, 0x0, 0x0, ...)
        /go/src/github.com/cockroachdb/cockroach/storage/replica.go:2357 +0x92a
github.com/cockroachdb/cockroach/storage.(*Replica).handleRaftReady(0xc4203a26c0, 0x0, 0x0)
        /go/src/github.com/cockroachdb/cockroach/storage/replica.go:1894 +0x8b8
github.com/cockroachdb/cockroach/storage.(*Store).processReady(0xc4201c6280, 0x15804)
        /go/src/github.com/cockroachdb/cockroach/storage/store.go:2571 +0xfd
github.com/cockroachdb/cockroach/storage.(*raftScheduler).worker(0xc42031c620, 0xc42040d560)
        /go/src/github.com/cockroachdb/cockroach/storage/scheduler.go:197 +0x308
github.com/cockroachdb/cockroach/storage.(*raftScheduler).Start.func1()
        /go/src/github.com/cockroachdb/cockroach/storage/scheduler.go:160 +0x33
github.com/cockroachdb/cockroach/util/stop.(*Stopper).RunWorker.func1(0xc42040d560, 0xc42074aee0)
        /go/src/github.com/cockroachdb/cockroach/util/stop/stopper.go:187 +0x7d
created by github.com/cockroachdb/cockroach/util/stop.(*Stopper).RunWorker
        /go/src/github.com/cockroachdb/cockroach/util/stop/stopper.go:188 +0x66