diff --git a/prism/src/userinterface/simulator/GUISimulator.java b/prism/src/userinterface/simulator/GUISimulator.java
index 8b5402aa..d9a9bf38 100644
--- a/prism/src/userinterface/simulator/GUISimulator.java
+++ b/prism/src/userinterface/simulator/GUISimulator.java
@@ -729,6 +729,8 @@ public class GUISimulator extends GUIPlugin implements MouseListener, ListSelect
 
 			// Get path details from dialog
 			GUIPathPlotDialog pathPlotDialog = GUIPathPlotDialog.showDialog(getGUI(), parsedModel);
+			if (pathPlotDialog == null)
+				return;
 			String simPathDetails = pathPlotDialog.getSimPathString();
 			if (simPathDetails == null)
 				return;