diff --git a/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java b/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java
index 698b6a3b..ce465a38 100644
--- a/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java
+++ b/wise-webapp/src/main/java/com/wisemapping/dao/MindmapManagerImpl.java
@@ -227,15 +227,18 @@ public class MindmapManagerImpl
     }
 
     @Override
-    public void removeMindmap(@NotNull final Mindmap mindMap) {
+    public void removeMindmap(@NotNull final Mindmap mindmap) {
         // Delete history first ...
         final Criteria hibernateCriteria = currentSession().createCriteria(MindMapHistory.class);
-        hibernateCriteria.add(Restrictions.eq("mindmapId", mindMap.getId()));
-        List list = hibernateCriteria.list();
+        hibernateCriteria.add(Restrictions.eq("mindmapId", mindmap.getId()));
+        final List list = hibernateCriteria.list();
         getHibernateTemplate().deleteAll(list);
 
+        // Remove collaborations ...
+        mindmap.removedCollaboration(mindmap.getCollaborations());
+
         // Delete mindmap ....
-        getHibernateTemplate().delete(mindMap);
+        getHibernateTemplate().delete(mindmap);
     }
 
     private void saveHistory(@NotNull final Mindmap mindMap) {
diff --git a/wise-webapp/src/main/java/com/wisemapping/model/Mindmap.java b/wise-webapp/src/main/java/com/wisemapping/model/Mindmap.java
index 22bf1d6f..d3cdf366 100644
--- a/wise-webapp/src/main/java/com/wisemapping/model/Mindmap.java
+++ b/wise-webapp/src/main/java/com/wisemapping/model/Mindmap.java
@@ -146,7 +146,11 @@ public class Mindmap implements Serializable {
     }
 
     public void removedCollaboration(@NotNull Collaboration collaboration) {
-        collaborations.add(collaboration);
+        collaborations.remove(collaboration);
+    }
+
+    public void removedCollaboration(@NotNull Set<Collaboration> collaborations) {
+        this.collaborations.removeAll(collaborations);
     }
 
     @NotNull
@@ -182,7 +186,7 @@ public class Mindmap implements Serializable {
     }
 
     public boolean isCreator(@NotNull User user) {
-        return this.getCreator()!=null && this.getCreator().identityEquality(user);
+        return this.getCreator() != null && this.getCreator().identityEquality(user);
     }
 
     public boolean isPublic() {
diff --git a/wise-webapp/src/main/java/com/wisemapping/rest/AccountController.java b/wise-webapp/src/main/java/com/wisemapping/rest/AccountController.java
index b9f6d93c..d6f0921b 100644
--- a/wise-webapp/src/main/java/com/wisemapping/rest/AccountController.java
+++ b/wise-webapp/src/main/java/com/wisemapping/rest/AccountController.java
@@ -129,7 +129,7 @@ public class AccountController extends BaseController {
         }
 
         // Delete labels ....
-        List<Label> labels = labelService.getAll(user);
+        final List<Label> labels = labelService.getAll(user);
         labels.forEach(l -> {
             try {
                 labelService.removeLabel(l, user);