diff --git a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/api/ActivityRepositoryApi.java b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/api/ActivityRepositoryApi.java
index c4cea41..18fcb68 100644
--- a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/api/ActivityRepositoryApi.java
+++ b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/api/ActivityRepositoryApi.java
@@ -20,7 +20,7 @@ public interface ActivityRepositoryApi {
 
     Activity read(String id);
     
-    void delete(String id);
+    boolean delete(String id);
     
     List<String> getYears();
 
diff --git a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/impl/sqlite/ActivityRepositorySQLiteImpl.java b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/impl/sqlite/ActivityRepositorySQLiteImpl.java
index b22dcd7..2f144fd 100644
--- a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/impl/sqlite/ActivityRepositorySQLiteImpl.java
+++ b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/persistence/impl/sqlite/ActivityRepositorySQLiteImpl.java
@@ -68,11 +68,11 @@ public class ActivityRepositorySQLiteImpl implements ActivityRepositoryApi {
     }
 
     @Override
-    public void delete(String id) {
+    public boolean delete(String id) {
         System.out.println("Going to delete: " + id);
         Activity activityToBeDeleted = read(id);
         if(!Utils.askYesNo(null, "Do you really want to delete this activity? " + read(id), "Deletion of activity")) {
-            return;
+            return false;
         }
 
         StringBuilder sb = new StringBuilder();
@@ -99,7 +99,7 @@ public class ActivityRepositorySQLiteImpl implements ActivityRepositoryApi {
             ex.printStackTrace();
             throw new TimeCalcException(ex);
         }
-
+        return true;
 
     }
 
diff --git a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/common/ActivityPanel.java b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/common/ActivityPanel.java
index 18455b4..00737dd 100644
--- a/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/common/ActivityPanel.java
+++ b/modules/time-calc-app/src/main/java/org/nanoboot/utils/timecalc/swing/common/ActivityPanel.java
@@ -220,9 +220,12 @@ public class ActivityPanel extends JPanel implements Comparable<ActivityPanel> {
         //            //dayPanel.moveMarkedActivityBeforeThisActivity(getActivity());
         //        });
         deleteButton.addActionListener(e -> {
-            activityRepository.delete(this.activity.getId());
-            this.setVisible(false);
-            deleted = true;
+            boolean deleted = activityRepository.delete(this.activity.getId());
+            if(deleted) {
+                this.setVisible(false);
+                deleted = true;
+            }
+
         });
         copyButton.addActionListener(e -> {
             activityRepository.putToClipboard(this.activity);