diff --git a/src/View/LateralContributionsAdisTS/UndoCommand.py b/src/View/LateralContributionsAdisTS/UndoCommand.py
index 08cf408a..8366f927 100644
--- a/src/View/LateralContributionsAdisTS/UndoCommand.py
+++ b/src/View/LateralContributionsAdisTS/UndoCommand.py
@@ -91,7 +91,7 @@ class AddCommand(QUndoCommand):
         self._new = None
 
     def undo(self):
-        self._lcs.delete_i(self._index)
+        self._lcs.delete_i([self._index])
 
     def redo(self):
         if self._new is None: