freeznet opened a new pull request #536:
URL: https://github.com/apache/pulsar-client-go/pull/536
### Motivation
```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0xc7bd24]
goroutine 129 [running]:
github.com/apache/pulsar-client-go/pulsar/internal.(*lookupService).GetPartitionedTopicMetadata(0xc00017ac80,
0xc00040c1e0, 0x2c, 0x0, 0x0, 0x5)
/go/pkg/mod/github.com/apache/[email protected]/pulsar/internal/lookup_service.go:193
+0x244
github.com/apache/pulsar-client-go/pulsar.(*client).TopicPartitions(0xc00010f860,
0xc00040c1e0, 0x2c, 0xc0005e6f80, 0x2, 0x2, 0xc0005e6f7c, 0x2)
/go/pkg/mod/github.com/apache/[email protected]/pulsar/client_impl.go:184
+0xa2
github.com/apache/pulsar-client-go/pulsar.(*consumer).internalTopicSubscribeToPartitions(0xc0001d01a0,
0x0, 0x0)
/go/pkg/mod/github.com/apache/[email protected]/pulsar/consumer_impl.go:250
+0x74
github.com/apache/pulsar-client-go/pulsar.(*consumer).runBackgroundPartitionDiscovery.func1(0xc0001280b0,
0xc00015c540, 0xc00017a190, 0xc0001d01a0)
/go/pkg/mod/github.com/apache/[email protected]/pulsar/consumer_impl.go:237
+0xce
created by
github.com/apache/pulsar-client-go/pulsar.(*consumer).runBackgroundPartitionDiscovery
/go/pkg/mod/github.com/apache/[email protected]/pulsar/consumer_impl.go:229
+0xcd
```
### Verifying this change
- [ ] Make sure that the change passes the CI checks.
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