diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/proctoring/ScreenProctoringServiceImpl.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/proctoring/ScreenProctoringServiceImpl.java
index 7aef6f5c..f7d3d549 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/proctoring/ScreenProctoringServiceImpl.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/session/impl/proctoring/ScreenProctoringServiceImpl.java
@@ -247,6 +247,10 @@ public class ScreenProctoringServiceImpl implements ScreenProctoringService {
     public void updateActiveGroups() {
         try {
 
+            if (!webserviceInfo.isMaster()) {
+                return;
+            }
+
             if (screenProctoringGroupDAO.hasActiveGroups()) {
                 screenProctoringAPIBinding
                         .getActiveGroupSessionCounts()