No, not really.
You should be expected to have some awareness of things that can go wrong and prepare for that eventuality.
It's really no different from faulting the home leasor for not checking for fungal infections/"fungal-proofing" the house/noting that they're not responsible for fungal infections that they're unaware of in contracts/etc.
So if someone got injured at your yard sale because of your neglect, then you're at fault. If a meteor dropped on their head, then it's not your fault. Because you couldn't reasonably anticipate such a thing occurring.
Getting a client injured is almost certainly going to be something due to your neglect, and any decent lawyer will rip you a new one if someone does get injured under your supervision.