A rope stopper system for a fiber rope (30) is described, where a rope stopper (10) is placed on a deck of an anchor handling vessel (50) or the like, and is arranged to grip and secure the fiber rope (30), that runs through the rope stopper (10). The rope stopper (10) comprises a frame (12) equipped with at several rotary stopper elements (14), where the stopper elements (14) are arranged in an opening (16) in the frame (12), said opening (16) being a through-running opening to receive the fiber rope (30), and where the stopper elements (14) are placed radially in the opening, and about the through-running fiber rope (30), arranged to lock the fiber rope (30), and the rope stopper (10) is equipped with a back support (22), in where the back support (22) is designed with an arched back side.