diff --git a/core/group_chat.go b/core/group_chat.go
index 78b3cd9..e5b0edf 100644
--- a/core/group_chat.go
+++ b/core/group_chat.go
@@ -118,9 +118,12 @@ func (gc *groupChat) ClientDisconnected(msg string, callby *wshandler.Sender) {
 			chanid := v.(string)
 			gc.leaveRoom(chanid, callby.Accid)
 			if k == "public" {
-				gc.rh.JSONNumIncrBy(chanid, "$.size", -1)
-				if cfg, ok := gc.chatConfig.Channels[chanid]; ok {
-					cfg.inoutChan <- "-" + callby.Alias
+				cnt, _ := gc.rh.JSONDel(chanid, "$.members."+callby.Alias)
+				if cnt > 0 {
+					gc.rh.JSONNumIncrBy(chanid, "$.size", -1)
+					if cfg, ok := gc.chatConfig.Channels[chanid]; ok {
+						cfg.inoutChan <- "-" + callby.Alias
+					}
 				}
 			} else {
 				gc.sendUpstreamMessage(&wshandler.UpstreamMessage{
@@ -179,10 +182,13 @@ func (gc *groupChat) LeavePublicChannel(ctx wshandler.ApiCallContext) {
 	chanid := ctx.Arguments[0].(string)
 	cnt, _ := gc.rh.JSONDel(ctx.CallBy.Accid.Hex(), "$.channel.public")
 	if cnt > 0 {
-		gc.leaveRoom(chanid, ctx.CallBy.Accid)
-		gc.rh.JSONNumIncrBy(chanid, "$.size", -1)
-		if cfg, ok := gc.chatConfig.Channels[chanid]; ok {
-			cfg.inoutChan <- "-" + ctx.CallBy.Alias
+		cnt, _ = gc.rh.JSONDel(chanid, "$.members."+ctx.CallBy.Alias)
+		if cnt > 0 {
+			gc.leaveRoom(chanid, ctx.CallBy.Accid)
+			gc.rh.JSONNumIncrBy(chanid, "$.size", -1)
+			if cfg, ok := gc.chatConfig.Channels[chanid]; ok {
+				cfg.inoutChan <- "-" + ctx.CallBy.Alias
+			}
 		}
 	}
 }