diff --git a/src/server/game/register_network_func.go b/src/server/game/register_network_func.go
index 279dcc29..fb684316 100644
--- a/src/server/game/register_network_func.go
+++ b/src/server/game/register_network_func.go
@@ -2174,7 +2174,12 @@ func ReqChampshipPreRank(player *Player, req *msg.ReqChampshipPreRank) error {
 		player.PushClientRes(&msg.ResChampshipPreRank{})
 		return nil
 	}
-	m := res.Extra.(*msg.ResChampshipPreRank)
+	m, ok := res.Extra.(*msg.ResChampshipPreRank)
+	if !ok {
+		player.PushClientRes(&msg.ResChampshipPreRank{})
+		log.Error("type assert failed for ResChampshipPreRank")
+		return nil
+	}
 	player.PushClientRes(m)
 	return nil
 }