If a tenant or guest is injured on rental property there may be a personal injury claim.
One important factor is where the accident happened. For example, did the injury occur in a common area like a pool or common staircase, or inside a dwelling unit? If inside a dwelling unit, did the tenant give the landlord notice of the defect?
In some situations laws protect both the tenants and guests. In other situations this is less clear.
Consult with an attorney for information about your situation.