Quoting Rick on this thread:
Quote
Basically this means that the size of the ubbt_ONLINE table is larger than the max_heap_table_size setting in the mysql config.

There are a couple ways to fix this. If this is your own server, then you can increase the max_heap_table_size setting and restart MySQL, otherwise you'll probably need to decrease the online activity setting in the control panel, so it tracks for a less amount of time.

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