Repair broken single instance check

servers/auth_server_lin/src/auth_conn.cpp

@@ -609,7 +609,7 @@ void AuthSocket::commandLoop() {
 											tempchar = m_databaseServiceTypesCursor->value("single_instance").toInt();
 											if (tempchar != 0) {
 												// Verify that service is not already in use
-												m_databaseActivityCursor->select(TQString("station=%1 AND serviceid=%2").arg(m_databaseStationsCursor->value("pk").toInt()).arg(sid));
+												m_databaseActivityCursor->select(TQString("station=%1 AND serviceid=%2").arg(m_stationID).arg(sid));
 												while (m_databaseActivityCursor->next()) {
 													if (m_databaseActivityCursor->value("username").toString() != "") {
 														available = false;