fatal error: concurrent map writes

[4n70w4]

var Counter *hyperloglog.Sketch

...

Counter = hyperloglog.New16()

...

		bpk := make([]byte, 8)
		binary.LittleEndian.PutUint64(bpk, pk)
		Counter.Insert(bpk)

fatal error: concurrent map writes

goroutine 458 [running]:
runtime.throw(0x788fc0, 0x15)
	/Go/src/runtime/panic.go:1114 +0x79 fp=0xc005f75e48 sp=0xc005f75e18 pc=0x435c49
runtime.mapassign_fast32(0x742f00, 0xc00813aba0, 0xc002276860, 0xa52e40)
	/Go/src/runtime/map_fast32.go:101 +0x328 fp=0xc005f75e88 sp=0xc005f75e48 pc=0x411028
github.com/axiomhq/hyperloglog.set.add(...)
	/Go/bin/src/github.com/axiomhq/hyperloglog/sparse.go:44
github.com/axiomhq/hyperloglog.(*Sketch).InsertHash(0xc0000615f0, 0x89da180ed69d24d0, 0x8)
	/Go/bin/src/github.com/axiomhq/hyperloglog/hyperloglog.go:220 +0x117 fp=0xc005f75ed0 sp=0xc005f75e88 pc=0x6d4797
github.com/axiomhq/hyperloglog.(*Sketch).Insert(0xc0000615f0, 0xc0020a7388, 0x8, 0x8, 0xc00848fa40)
	/Go/bin/src/github.com/axiomhq/hyperloglog/hyperloglog.go:214 +0x65 fp=0xc005f75f00 sp=0xc005f75ed0 pc=0x6d4665
main.BulkWorker(0x18ad287d)
	/src/BulkRequest.go:92 +0x1cb fp=0xc005f75f58 sp=0xc005f75f00 pc=0x6da52b
main.main.func1(0x70c3c0, 0xc00205eaa0)
	/src/api.go:71 +0x46 fp=0xc005f75f80 sp=0xc005f75f58 pc=0x6dccd6
github.com/panjf2000/ants.(*goWorkerWithFunc).run.func1(0xc005d43290)
	/Go/bin/src/github.com/panjf2000/ants/worker_func.go:68 +0xb7 fp=0xc005f75fd8 sp=0xc005f75f80 pc=0x6d9b07
runtime.goexit()
	/Go/src/runtime/asm_amd64.s:1373 +0x1 fp=0xc005f75fe0 sp=0xc005f75fd8 pc=0x4626f1
created by github.com/panjf2000/ants.(*goWorkerWithFunc).run
	/Go/bin/src/github.com/panjf2000/ants/worker_func.go:48 +0x53

[cupen]

It works as expected.
You should use sync.Mutex or sync.Once if you want to initializing a singleton instance in multi-threaded.
https://pkg.go.dev/sync

[seiflotfy]

Thank you @cupen 😄