As reported on IRC: smcv: if tp_connection_get_contacts_by_id is used with invalid ids only, than tp_connection_get_contact_attributes fails on n_handles>=1 check. probably, contacts_get_attributes should check handles->len before calling tp_connection_get_contact_attributes? I'll fix this tomorrow.
Fixed in a branch.
Fixed in git, will be in 0.7.25.
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