An employer is generally immune from a lawsuit for personal injury.
Maryland employers generally enjoy what is called workers' compensation immunity. Years ago, at the turn of the previous century, if an employee was injured at work, they had to sue their employer and had to prove fault under general negligence or general legal principles. States have moved away from that and adopted a no-fault system of workers' compensation benefits. Here, if an employee is injured accidentally during the scope and course of their employment, they're entitled to statutory workers' compensation benefits on a no-fault basis. The trade-off for that is that they no longer have a right and cannot sue their employer for negligence or other legal remedies.