diff --git a/plugins/SimulationView/SimulationView.py b/plugins/SimulationView/SimulationView.py
index b7bff91f9b..44f472129f 100644
--- a/plugins/SimulationView/SimulationView.py
+++ b/plugins/SimulationView/SimulationView.py
@@ -154,6 +154,7 @@ class SimulationView(View):
     def _onSceneChanged(self, node):
         self.setActivity(False)
         self.calculateMaxLayers()
+        self.calculateMaxPathsOnLayer(self._current_layer_num)
 
     def isBusy(self):
         return self._busy