diff --git a/src/net/java/sip/communicator/impl/gui/main/contactlist/PresenceFilter.java b/src/net/java/sip/communicator/impl/gui/main/contactlist/PresenceFilter.java
index 64ed8b050..b30a517bc 100644
--- a/src/net/java/sip/communicator/impl/gui/main/contactlist/PresenceFilter.java
+++ b/src/net/java/sip/communicator/impl/gui/main/contactlist/PresenceFilter.java
@@ -311,20 +311,36 @@ private void addMatching(   MetaContactGroup metaGroup,
                     UIContact newUIContact;
                     synchronized (metaContact)
                     {
-                        newUIContact = MetaContactListSource
-                            .createUIContact(metaContact);
-                    }
+                        newUIContact 
+                            = MetaContactListSource.getUIContact(metaContact);
 
-                    GuiActivator.getContactList().addContact(
-                            newUIContact,
-                            uiGroup,
-                            true,
-                            true);
+                        if (newUIContact == null)
+                        {
+                            newUIContact = MetaContactListSource
+                                .createUIContact(metaContact);
+                            
+                            GuiActivator.getContactList().addContact(
+                                    newUIContact,
+                                    uiGroup,
+                                    true,
+                                    true);
+                        }
+                        
+                    }
 
                     query.setInitialResultCount(resultCount);
                 }
                 else
-                    query.fireQueryEvent(metaContact);
+                {
+                    synchronized (metaContact)
+                    {
+                        if (MetaContactListSource.getUIContact(metaContact) 
+                            == null)
+                        {
+                            query.fireQueryEvent(metaContact);
+                        }
+                    }
+                }
             }
         }
 
diff --git a/src/net/java/sip/communicator/impl/gui/main/contactlist/TreeContactList.java b/src/net/java/sip/communicator/impl/gui/main/contactlist/TreeContactList.java
index e614a4ba5..7da4d5e6b 100644
--- a/src/net/java/sip/communicator/impl/gui/main/contactlist/TreeContactList.java
+++ b/src/net/java/sip/communicator/impl/gui/main/contactlist/TreeContactList.java
@@ -569,24 +569,34 @@ private void createMetaUIRootGroup()
     {
         MetaContactGroup rootGroup 
             = GuiActivator.getContactListService().getRoot();
-        UIGroup uiGroup = MetaContactListSource
-            .getUIGroup(rootGroup);
+        UIGroup uiGroup;
+        synchronized (rootGroup)
+        {
+            uiGroup = MetaContactListSource
+                .getUIGroup(rootGroup);
 
-        if (uiGroup != null)
-            return;
+            if (uiGroup != null)
+                return;
             
-        uiGroup = MetaContactListSource
-            .createUIGroup(rootGroup);
-        
+            uiGroup = MetaContactListSource
+                .createUIGroup(rootGroup);
+        }
         
         treeModel.getRoot().sortedAddContactGroup((UIGroupImpl)uiGroup);
         Iterator<MetaContact> i = rootGroup.getChildContacts();
         while (i.hasNext())
         {
             MetaContact contact = i.next();
-            UIContact uiContact = MetaContactListSource.getUIContact(contact);
-            removeContact(uiContact);
-            uiContact = MetaContactListSource.createUIContact(contact);
+            UIContact uiContact;
+            synchronized (contact)
+            {
+                uiContact
+                    = MetaContactListSource.getUIContact(contact);
+                if(uiContact == null)
+                    continue;
+                removeContact(uiContact);
+                uiContact = MetaContactListSource.createUIContact(contact);
+            }
             if (currentFilter.isMatching(uiContact))
                 addContact(uiContact, uiGroup, true, true);
             else
@@ -602,11 +612,15 @@ private void removeMetaUIRootGroup()
         MetaContactGroup rootGroup 
             = GuiActivator.getContactListService().getRoot();
         
-        UIGroup uiGroup = MetaContactListSource
-            .getUIGroup(rootGroup);
+        UIGroup uiGroup;
+        synchronized (rootGroup)
+        {
+            uiGroup = MetaContactListSource
+                .getUIGroup(rootGroup);
 
-        if (uiGroup == null)
-            return;
+            if (uiGroup == null)
+                return;
+        }
         
         GroupNode parentNode = treeModel.getRoot();
         
@@ -614,10 +628,16 @@ private void removeMetaUIRootGroup()
         while (i.hasNext())
         {
             MetaContact contact = i.next();
-            UIContact uiContact 
-                = MetaContactListSource.getUIContact(contact);
-            removeContact(uiContact);
-            uiContact = MetaContactListSource.createUIContact(contact);
+            UIContact uiContact;
+            synchronized (contact)
+            {
+                uiContact
+                    = MetaContactListSource.getUIContact(contact);
+                if(uiContact == null)
+                    continue;
+                removeContact(uiContact);
+                uiContact = MetaContactListSource.createUIContact(contact);
+            }
             if (currentFilter.isMatching(uiContact))
                 addContact(uiContact, treeModel.getRoot().getGroupDescriptor(),
                     true, true);
diff --git a/src/net/java/sip/communicator/impl/gui/main/contactlist/contactsource/MetaContactListSource.java b/src/net/java/sip/communicator/impl/gui/main/contactlist/contactsource/MetaContactListSource.java
index e182b3e37..cdc47815b 100644
--- a/src/net/java/sip/communicator/impl/gui/main/contactlist/contactsource/MetaContactListSource.java
+++ b/src/net/java/sip/communicator/impl/gui/main/contactlist/contactsource/MetaContactListSource.java
@@ -258,22 +258,40 @@ public void queryMetaContactSource(Pattern filterPattern,
                     }
 
                     UIContact newUIContact;
+                    boolean uiContactCreated = false;
                     synchronized (metaContact)
                     {
-                        newUIContact
-                            = MetaContactListSource.createUIContact(metaContact);
+                        newUIContact 
+                            = MetaContactListSource.getUIContact(metaContact);
+    
+                        if (newUIContact == null)
+                        {
+                            newUIContact
+                                = MetaContactListSource
+                                    .createUIContact(metaContact);
+                            
+                            GuiActivator.getContactList().addContact(
+                                newUIContact,
+                                uiGroup,
+                                true,
+                                true);
+                        }
+                        
                     }
-
-                    GuiActivator.getContactList().addContact(
-                        newUIContact,
-                        uiGroup,
-                        true,
-                        true);
-
+                    
                     query.setInitialResultCount(resultCount);
                 }
                 else
-                    query.fireQueryEvent(metaContact);
+                {
+                    synchronized (metaContact)
+                    {
+                        if (MetaContactListSource.getUIContact(metaContact) 
+                            == null)
+                        {
+                            query.fireQueryEvent(metaContact);
+                        }
+                    }
+                }
             }
         }