Not my bug spotted, but sticking in tracker from forum after another person reported it

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Using RC4 and altering cookie settings gives an error in admin log because log data is empty.
Same for server load.

Seems $row['log_data'] isn't empty but contains s:0:"";

Forum Topic: https://area51.phpbb.com/phpBB/viewtopic.php?f=81&p=269723&sid=43487307a8683b2924621c010d4e5517#p269723