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Read the logs to find out what the users are doing, and then throttle it on a proxy or simply deactivate the misbehaving users.
Hmm. That's a template being broken, but it actually looks like the template is being fed bad data, probably by a poorly written custom field add-on. (I can say that, I've written custom field add-ons that do something similar)
I'd ask the user what filter they are running and get them to look at the columns defined for it. Then look at the field type for each column - what are all the custom field types for them? Are there any non-standard ones?
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