diff --git a/navipy/moving/agent.py b/navipy/moving/agent.py
index 65f2dde1883f141c33f6d86ccf6c101a8652bc1c..f7ad52af14e0e79a64d3873dc2b1bec79da9c629 100644
--- a/navipy/moving/agent.py
+++ b/navipy/moving/agent.py
@@ -435,7 +435,7 @@ the agent motion, or
                 print('Remain {}, done in {}'.format(remain, remain*t_peritem))
                 if filename is not None:
                     self.velocities.to_hdf(filename, key='velocities')
-
+                prev_nline = nline
             nline += 1
         return self.velocities.copy()