In Gabble 0.9.0 and 0.9.1, if GetContactCapabilities is called on a contact whose presence is not in the presence cache, Gabble will crash. This is fixed in git for 0.9.2. This bug is unlikely to exist in 0.8.x (the relevant code in 0.9 was refactored quite extensively to accommodate the final ContactCapabilities spec).
telepathy-gabble 0.9.2 was released.
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