alan2016llg opened a new issue, #2714:
URL: https://github.com/apache/dubbo-go/issues/2714
### Environment
<!--
- Server: Dubbo-go, v3.0.5
- Client: Dubbo-go, v3.0.5
- Protocol: Triple
- Registry: Nacos, v2.0.0
-->
- Server:
- Client:
- Protocol:
- Registry:
### Issue description
<!-- Here is a brief description about the issue. -->
### Logs
<details><summary>Click me to check logs</summary>
```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x1cd2871]
goroutine 7179829 [running]:
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.(*ServiceInstancesChangedListenerImpl).OnEvent(0xc0044bb940,
{0x2d07e10?, 0xc00f77e960})
/home/zmn/go/pkg/mod/github.com/alan2016llg/dubbo-go/[email protected]/registry/servicediscovery/service_instances_changed_listener_impl.go:125
+0x10d1
dubbo.apache.org/dubbo-go/v3/registry/zookeeper.(*zookeeperServiceDiscovery).DataChange(0xc000397180,
{{0xc006fa2f60, 0x2b}, 0x0, {0xc007b47180, 0x32a}})
/home/zmn/go/pkg/mod/github.com/alan2016llg/dubbo-go/[email protected]/registry/zookeeper/service_discovery.go:282
+0x557
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).handleZkNodeEvent(0xc003732570,
{0xc010254018, 0x17}, {0xc00b14c010, 0x1, 0x1?}, {0x2ce3ce0, 0xc000397180})
/home/zmn/go/pkg/mod/github.com/alan2016llg/dubbo-go/[email protected]/remoting/zookeeper/listener.go:212
+0x536
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).startScheduleWatchTask(0xc003732570,
{0xc001d2de78, 0x17}, {0xc00b14c010, 0x1, 0x1}, 0x8bb2c97000, {0x2ce3ce0,
0xc000397180}, 0xc00415b380)
/home/zmn/go/pkg/mod/github.com/alan2016llg/dubbo-go/[email protected]/remoting/zookeeper/listener.go:454
+0x5ae
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).listenDirEvent(0xc003732570,
0x0, {0xc001d2de78, 0x17}, {0x2ce3ce0?, 0xc000397180}, {0x0, 0x0})
/home/zmn/go/pkg/mod/github.com/alan2016llg/dubbo-go/[email protected]/remoting/zookeeper/listener.go:422
+0x5b1
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).ListenServiceEvent.func1({0xc001d2de78,
0x17}, {0x2ce3ce0?, 0xc000397180?})
/home/zmn/go/pkg/mod/github.com/alan2016llg/dubbo-go/[email protected]/remoting/zookeeper/listener.go:480
+0xb7
created by
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).ListenServiceEvent
/home/zmn/go/pkg/mod/github.com/alan2016llg/dubbo-go/[email protected]/remoting/zookeeper/listener.go:475
+0x1be
```
</details>
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