weichangdong opened a new issue #690:
URL: https://github.com/apache/rocketmq-client-go/issues/690
go mod use this version
```
github.com/apache/rocketmq-client-go/v2 v2.1.0
```
```
err = rocketmqclient.RocketmqProducer.SendAsync(context.Background(),
func(ctx context.Context, result *primitive.SendResult, e
error) {
if e != nil || result == nil || (result != nil &&
result.Status != primitive.SendOK) {
logs.Error("SendAsync SendAsync message error:
", e, " result:", result, " msgLen:", len(string(msgByte)), " ctime:", ctime, "
relatedUid:", relatedUid, " relatedTid:", relatedTid)
if result != nil {
logs.Error("result:", result.String())
}
err = e
sendOk = false
} else {
sendOk = true
}
}, rocketmqMsg)
```
the log output
```
SendAsync SendAsync message error: <nil> result: %!v(PANIC=String method:
runtime error: invalid memory address or nil pointer dereference) msgLen:
788741 ctime: 1624901003080 relatedUid: radtatmbcpg5cemoqjs8t324l0
relatedTid:
```
maxMessageSize=65536
Although our setting is small, it should not panic
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