Legal Question in Personal Injury in Illinois

Insufficient information but if the business owner controls the lot and creates an unreasonable risk to business invitees, yes very possibly. But that is what business owners should have insurance for: premises liability. Then again, if this is a parking lot in a shopping center with multiple tenants, often the injured party will "sue everyone" (business owner/tenant, shopping center owner, manager....) as the injured party will usually not know who is responsible to owe the injured party the duty of care.....

Only if the owner of the business was somehow responsible for the fall or created a dangerous condition causing the fall.