baerwang commented on issue #739:
URL:
https://github.com/apache/rocketmq-client-go/issues/739#issuecomment-961628115
In the exampls/admin/topic directory
```error
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0xedcc73]
goroutine 1 [running]:
github.com/apache/rocketmq-client-go/v2/internal.GetOrNewRocketMQClient(0xf6dbee,
0xb, 0x0, 0x0, 0x0, 0x0, 0xc00000a260, 0xc, 0xc000012ac0, 0x34, ...)
/opt/rocketmq-client-go/internal/client.go:191 +0x3b3
github.com/apache/rocketmq-client-go/v2/admin.NewAdmin(0xc00010fd78, 0x1,
0x1, 0x0, 0x0, 0x0, 0x0)
/opt/rocketmq-client-go/admin/admin.go:79 +0x167
main.main()
/opt/rocketmq-client-go/examples/admin/topic/main.go:34 +0x1ad
```
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