Oct  7 12:28:23.311313 INF start shard rebalance avg-shard-ratio=+Inf component=load-balancer max-node-load-ratio=0 min-node-load-ratio=0 quarantine-nodes=[]
Oct  7 12:28:23.311867 INF end shard rebalance avg-shard-ratio=+Inf component=load-balancer max-node-load-ratio=0 min-node-load-ratio=0
Oct  7 12:28:23.312078 INF start leader rebalance component=load-balancer node-leaders={} quarantine-shards=[]
Oct  7 12:28:23.312220 INF end leader rebalance component=load-balancer
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x2 addr=0x8 pc=0x105f13b98]

goroutine 29 [running]:
github.com/emirpasic/gods/v2/lists/arraylist.(*List[...]).Size(...)
	/Users/mmerli/go/pkg/mod/github.com/emirpasic/gods/v2@v2.0.0-alpha.0.20250312000129-1d83d5ae39fb/lists/arraylist/arraylist.go:105
github.com/emirpasic/gods/v2/lists/arraylist.(*Iterator[...]).Next(...)
	/Users/mmerli/go/pkg/mod/github.com/emirpasic/gods/v2@v2.0.0-alpha.0.20250312000129-1d83d5ae39fb/lists/arraylist/iterator.go:28
github.com/oxia-db/oxia/coordinator/balancer.(*nodeBasedBalancer).rebalanceLeader(0x140001e98c0)
	/Users/mmerli/prg/oxia/coordinator/balancer/scheduler.go:394 +0x208
github.com/oxia-db/oxia/coordinator/balancer.(*nodeBasedBalancer).startBackgroundNotifier.func1()
	/Users/mmerli/prg/oxia/coordinator/balancer/scheduler.go:359 +0xc8
github.com/oxia-db/oxia/common/process.DoWithLabels.func1({0x106af1048?, 0x140001ca000?})
	/Users/mmerli/prg/oxia/common/process/pprof.go:46 +0x24
runtime/pprof.Do({0x106af1080?, 0x14000472370?}, {{0x140004a4020?, 0x1046f67e4?, 0x14000126ee8?}}, 0x140004f6f88)
	/Users/mmerli/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.24.2.darwin-arm64/src/runtime/pprof/runtime.go:51 +0x78
github.com/oxia-db/oxia/common/process.DoWithLabels({0x106af1080, 0x14000472370}, 0x14000162150, 0x1400028d0b0)
	/Users/mmerli/prg/oxia/common/process/pprof.go:42 +0x1b4
created by github.com/oxia-db/oxia/coordinator/balancer.(*nodeBasedBalancer).startBackgroundNotifier in goroutine 1
	/Users/mmerli/prg/oxia/coordinator/balancer/scheduler.go:348 +0x134