alan2016llg opened a new issue, #2650:
URL: https://github.com/apache/dubbo-go/issues/2650
### Environment
<!--
- Server: Dubbo-go, v3.0.5
- Client: Dubbo-go, v3.0.5
- Protocol: Triple
- Registry: Nacos, v2.0.0
-->
- Server: java-dubbo
- Client: Dubbo-go, v3.1.1-rc
- Protocol: dubbo
- Registry: zk
### Issue description
应用挂了，查询docker最后日志，有一个panic出现，日志如下
<!-- Here is a brief description about the issue. -->
### Logs
<details><summary>Click me to check logs</summary>
```
2024-04-02 10:25:39 INFO getty/listener.go:90 session{session
session-closed, Read Bytes: 21708, Write Bytes: 1248, Read Pkgs: 4, Write Pkgs:
4} is closing......
2024-04-02 10:25:39 INFO getty/pool.go:221 after remove
session{session session-closed, Read Bytes: 21708, Write Bytes: 1248, Read
Pkgs: 4, Write Pkgs: 4}, left session number:0
2024-04-02 10:25:39 WARN dubbo/dubbo_protocol.go:94 can't dial
the server: 192.168.50.49:17624
2024-04-02 10:25:39 WARN dubbo/dubbo_protocol.go:94 can't dial
the server: 192.168.50.49:17624
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x28 pc=0x166ded4]
goroutine 132598 [running]:
dubbo.apache.org/dubbo-go/v3/metadata/service/local.(*MetadataServiceProxy).GetMetadataInfo(0xc0018c4320,
{0xc0018f4460?, 0xc00049c0a0?})
/home/zmn/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.1-rc1/metadata/service/local/service_proxy.go:183
+0x394
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.GetMetadataInfo({0xc001d47b90?,
0x1e09060?}, {0x27803a0, 0xc00049c0a0}, {0xc0018f4460, 0x20})
/home/zmn/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.1-rc1/registry/servicediscovery/service_instances_changed_listener_impl.go:257
+0x2a5
dubbo.apache.org/dubbo-go/v3/registry/servicediscovery.(*ServiceInstancesChangedListenerImpl).OnEvent(0xc001948100,
{0x27671c0?, 0xc001211db0})
/home/zmn/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.1-rc1/registry/servicediscovery/service_instances_changed_listener_impl.go:125
+0x8bf
dubbo.apache.org/dubbo-go/v3/registry/zookeeper.(*zookeeperServiceDiscovery).DataChange(0xc0004a39d0,
{{0xc003e0b9c0, 0x38}, 0x0, {0xc0014ca700, 0x30b}})
/home/zmn/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.1-rc1/registry/zookeeper/service_discovery.go:282
+0x303
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).listenDirEvent(0xc0024aae10,
0x0, {0xc000484660, 0x24}, {0x27491c0, 0xc0004a39d0}, {0x0, 0x0})
/home/zmn/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.1-rc1/remoting/zookeeper/listener.go:406
+0xb7a
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).ListenServiceEvent.func1({0xc000484660,
0x24}, {0x27491c0?, 0xc0004a39d0?})
/home/zmn/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.1-rc1/remoting/zookeeper/listener.go:480
+0xb1
created by
dubbo.apache.org/dubbo-go/v3/remoting/zookeeper.(*ZkEventListener).ListenServiceEvent
in goroutine 132645
/home/zmn/go/pkg/mod/dubbo.apache.org/dubbo-go/v3@v3.1.1-rc1/remoting/zookeeper/listener.go:475
+0x17c
```
</details>
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