diff --git a/src/main/java/ch/psi/mxsc/Puck.java b/src/main/java/ch/psi/mxsc/Puck.java
index cfec614..46f6a00 100644
--- a/src/main/java/ch/psi/mxsc/Puck.java
+++ b/src/main/java/ch/psi/mxsc/Puck.java
@@ -338,6 +338,9 @@ public class Puck extends DeviceBase {
 
     public String getId() {
         //return "XXX000" + index;
+        if (getDetection()!=Detection.Present){
+            return null;
+        }
         return id;
     }