FIGS. 2a and 2 b; [0017]FIGS. 3a and 3 b are a top view and a perspective view of a second embodiment of the insert that can be used with the gas generator according to the invention; [0018]FIG. 3c is a top view of the membrane with a tear line that is formed by the insert according to FIGS. 3a and 3 b; [0019]FIGS. 4a and 4 b are a top view and a perspective view of a third embodiment of an insert