I'm sure there is, although I don't think some of the more high-profile fan intruders ever sued (thinking of the guy who Rob Ray beat up in Quebec City or the Mike Milbury shoe victim, for example). While it's not quite the same, by analogy, there are some famous cases where the question of "voluntary assumption of risk" is involved, and, in short, it's really hard to prove. (This is part of the reason why people might successfully sue for injury despite signing a waiver or, in the case of sporting events, often having one printed on the back of your ticket as a condition of attending). It'll always come down to specific facts in each case.
All of which to say, in law it's seldom as simple as "Well you did something dumb, so it's your own fault." Responsibility can and is apportioned to varying degrees all the time. Reasonableness and proportionality will be always be dissected. It's the same reason why a trampoline owner can be liable for keeping their own trampoline on their own property, if some idiot trespasses and uses it badly, or a homeowner can't set up a spring-loaded shotgun to blast intruders as they enter illegally, even though that seems to protect criminals.
