No need to close the socket, it is done automatically

https://doc.qt.io/qt-6/qtcpsocket.html#dtor.QTcpSocket

launcher/ui/pages/instance/McClient.hpp

@@ -95,10 +95,6 @@ public:
         return doc.object();
     }
 
-    void close() {
-        socket.close();
-    }
-
 private:
     // From https://wiki.vg/Protocol#VarInt_and_VarLong
     void writeVarInt(QByteArray &data, int value) {

launcher/ui/pages/instance/ServersPage.cpp

@@ -148,8 +148,6 @@ class ServerPingTask : public Task {
             int online = client.getOnlinePlayers();
             qDebug() << "Online players: " << online;
             m_server.m_currentPlayers = online;
-
-            client.close();
         });
         resolver->ping();
     }