We so far refetched the first observer after evaluating bindings, as binding evaluating might change the list of observers. However, that approach did not take into account that the 'this' pointer might no longer be valid after binding evaluation: In case of a QObjectBindableProperty (or a QObjectCompatProperty), binding evaluation might cause a reallocation of the binding storage, and consequently the invalidation of the QPropertyBindingData. Fix this by refetching the QPropertyBindingData from the storage (if a storage has been provided, which is always the case for the affected classes). Fixes: QTBUG-111268 Pick-to: 6.5 6.4 6.2 Change-Id: Ie7e143a0bbb18f1c3f88a81dd9b31e6af463584f Reviewed-by: Ivan Solovev <ivan.solovev@qt.io> Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>