Yep I figured it out thanks to that. The problem happens when you link a unit as an artist, and then the same unit again as a member of itself. I guess that wackiness triggers an infinite loop or some other error and VGMdb serves up a 500 error.
(The problem occurred here because propanmode is both a group AND the name of a specific person in that group. So on that album it's, uh, "propan_mode (propanmode, hos)." The inner propanmode shouldn't be linked to the group.)
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