I got that exact same error when upgrading from ubb5.10 to ubb5.47.
I think the 5.10 board was hacked before I inherited it to give custom ranks, which ubb5.47 decided to randomly interpret as an error :oS
I had to just live with ignoring the error - even after removing everyones custom ranks in ubb5.10 before upgrading, it still spat the error out about certain members :oS
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