From 230b6edc9f0148436cdcd532e11b758e36a7b750 Mon Sep 17 00:00:00 2001
From: anhefti <andreas.hefti@let.ethz.ch>
Date: Thu, 12 Nov 2020 14:05:59 +0100
Subject: [PATCH] fixed logout error

---
 .../seb/sebserver/gui/service/session/ProctoringGUIService.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ProctoringGUIService.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ProctoringGUIService.java
index c42c1bec..68af492d 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ProctoringGUIService.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ProctoringGUIService.java
@@ -234,7 +234,7 @@ public class ProctoringGUIService {
     public void clear() {
 
         if (!this.rooms.isEmpty()) {
-            this.rooms.keySet()
+            new ArrayList<>(this.rooms.keySet())
                     .stream()
                     .forEach(this::closeRoom);
             this.rooms.clear();