Unwanted particle trail when looping back on an open Spline

Hi there, I am using the “BP_Spline_Location” BP from the samples which implements a particle following a spline component. The spline is closed in the sample. I would like to reuse it with an open spline (To show streamlines) . the problem is that when the particle reaches the end of the spline and restart from the spline 1st point there is a big straight trail that goes from the spline end to its start. Tried to look at the particle settings , the timeline driving it etc but can’t see what to do. Any idea ? Thanks !