Add missing error to log line

portal.go

@@ -1496,7 +1496,7 @@ func (portal *Portal) HandleMatrixReadReceipt(brUser bridge.User, eventID id.Eve
 	}
 	resp, err := sender.Session.ChannelMessageAckNoToken(msg.DiscordProtoChannelID(), msg.DiscordID)
 	if err != nil {
-		portal.log.Warnfln("Failed to handle read receipt for %s/%s from %s: %v", msg.MXID, msg.DiscordID, sender.MXID)
+		portal.log.Warnfln("Failed to handle read receipt for %s/%s from %s: %v", msg.MXID, msg.DiscordID, sender.MXID, err)
 	} else if resp.Token != nil {
 		portal.log.Debugfln("Marked %s/%s as read by %s (and got unexpected non-nil token %s)", msg.MXID, msg.DiscordID, sender.MXID, *resp.Token)
 	} else {