Same probleme here with latest 2020.3.4 version. Seems to be caused by this terrasync newly added data: https://cdn.merspieler.tk/terrasync/Airports/L/S/Z/LSZH.rwyuse.xml In function RunwayGroup::setActive(), the first list element rwyList[0] gives the expected size of all other lists (nrOfPreferences=6), but in the case of the LSZH airport, the other lists have fewer elements (5), explaining the access to an unexisting element with: rwyList[j].getRwyList(i), with j=2 and i=5