fix: already subscribe to topic (#231)

FISCO-BCOS · Sep 20, 2023 · f346c39 · f346c39
1 parent 584756b
commit f346c39
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/conn/channel.go b/conn/channel.go
@@ -752,7 +752,7 @@ func (hc *channelSession) subscribeTopic(topic string, handler func([]byte, *[]b
 	if handler == nil {
 		return errors.New("handler is nil")
 	}
-	if _, ok := hc.topicHandlers[topic]; ok {
+	if oldHandler, ok := hc.topicHandlers[topic]; ok && oldHandler != nil {
 		return errors.New("already subscribed to topic " + topic)
 	}
 	hc.topicMu.Lock()