Right after creating muc channel in src/conn-olpc.c:add_activity_info(), new activity contains NULL in "id" property. It is possible (in sugar-0.92) to query gabble for activity properties before setting "id", i.e., activity->id is NULL in src/conn-olpc.c:find_activity_by_id().
Downstream bug, http://bugs.sugarlabs.org/ticket/2973
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