A fix from runing the tests

xsuite · Jun 10, 2023 · 1de1957 · 1de1957
1 parent 4c41e0e
commit 1de1957
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/xtrack/twiss.py b/xtrack/twiss.py
@@ -1314,7 +1314,8 @@ def _build_auxiliary_tracker_with_extra_markers(tracker, at_s, marker_prefix,
 
     auxline = xt.Line(elements=list(tracker.line.elements).copy(),
                       element_names=list(tracker.line.element_names).copy())
-    auxline.particle_ref = tracker.line.particle_ref.copy()
+    if tracker.line.particle_ref is not None:
+        auxline.particle_ref = tracker.line.particle_ref.copy()
 
     names_inserted_markers = []
     markers = []