prevent object index reuse

server/channelserver/handlers_object.go

@@ -10,9 +10,25 @@ import (
 func handleMsgSysCreateObject(s *Session, p mhfpacket.MHFPacket) {
 	pkt := p.(*mhfpacket.MsgSysCreateObject)
 
+	// Prevent reusing an object index
+	var nextID uint32
+	for {
+		exists := false
+		nextID = s.stage.NextObjectID()
+		for _, object := range s.stage.objects {
+			if object.id == nextID {
+				exists = true
+				break
+			}
+		}
+		if exists == false {
+			break
+		}
+	}
+
 	s.stage.Lock()
 	newObj := &Object{
-		id:          s.stage.NextObjectID(),
+		id:          nextID,
 		ownerCharID: s.charID,
 		x:           pkt.X,
 		y:           pkt.Y,