client panic when shutdown the cluster by force

[3AceShowHand]

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x10188dfbc]

goroutine 2978 [running]:
github.com/tikv/pd/client.(*client).ScanRegions(0x14000d0ac60, {0x10671f7f8, 0x14003e4fa90}, {0x14001fab770, 0x24, 0x24}, {0x14001fab7a0, 0x24, 0x24}, 0x400, ...)
        github.com/tikv/pd/client@v0.0.0-20240103101103-a4d2f1ca365a/client.go:1040 +0x4ac
github.com/tikv/client-go/v2/internal/locate.(*RegionCache).scanRegions(0x14002e66300, 0x1400388be60, {0x14001fab770, 0x24, 0x24}, {0x14001fab7a0, 0x24, 0x24}, 0x400)
        github.com/tikv/client-go/v2@v2.0.8-0.20231227070846-61c486af13a5/internal/locate/region_cache.go:1864 +0x2bc
github.com/tikv/client-go/v2/internal/locate.(*RegionCache).BatchLoadRegionsWithKeyRange(0x14002e66300, 0x4?, {0x14001fab770, 0x24, 0x24}, {0x14001fab7a0, 0x24, 0x24}, 0x14005181658?)
        github.com/tikv/client-go/v2@v2.0.8-0.20231227070846-61c486af13a5/internal/locate/region_cache.go:1425 +0x54
github.com/pingcap/tiflow/cdc/kv.(*SharedClient).divideAndScheduleRegions(0x14000fcc280, {0x10671f7f8?, 0x14003e4fa90}, {0x0, {0x14001fab770, 0x24, 0x24}, {0x14001fab7a0, 0x24, 0x24}}, ...)
        github.com/pingcap/tiflow/cdc/kv/shared_client.go:465 +0x468
github.com/pingcap/tiflow/cdc/kv.(*SharedClient).handleRequestRanges.func1()
        github.com/pingcap/tiflow/cdc/kv/shared_client.go:438 +0x4c
golang.org/x/sync/errgroup.(*Group).Go.func1()
        golang.org/x/sync@v0.5.0/errgroup/errgroup.go:75 +0x58
created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 832
        golang.org/x/sync@v0.5.0/errgroup/errgroup.go:72 +0x98