diff --git a/src/main/java/fiji/plugin/trackmate/detector/lacss/LacssDetectorFactory.java b/src/main/java/fiji/plugin/trackmate/detector/lacss/LacssDetectorFactory.java
index 5b8dd2c..ba320b6 100644
--- a/src/main/java/fiji/plugin/trackmate/detector/lacss/LacssDetectorFactory.java
+++ b/src/main/java/fiji/plugin/trackmate/detector/lacss/LacssDetectorFactory.java
@@ -165,9 +165,12 @@ private void addOnShutdownHook()
 			public void run()
 			{
 				// new File(pyFilePath).delete();
-				new File(modelPath).delete();
-
-				if (pyServer.isAlive()) {
+				if (settings.get(KEY_LACSS_MODEL) == PretrainedModel.Default)
+				{
+					new File(modelPath).delete();
+				}
+				if (pyServer.isAlive()) 
+				{
 					pyServer.destroy();
 				}
 			}