diff --git a/retroshare-gui/src/gui/msgs/MessagesDialog.cpp b/retroshare-gui/src/gui/msgs/MessagesDialog.cpp
index 480959bb8..36fd4985f 100644
--- a/retroshare-gui/src/gui/msgs/MessagesDialog.cpp
+++ b/retroshare-gui/src/gui/msgs/MessagesDialog.cpp
@@ -401,6 +401,7 @@ MessagesDialog::~MessagesDialog()
 
     rsEvents->unregisterEventsHandler(mEventHandlerId);
     rsEvents->unregisterEventsHandler(mTagEventHandlerId);
+    delete ui.messageTreeWidget->itemDelegateForColumn(RsMessageModel::COLUMN_THREAD_AUTHOR) ;
 }
 
 UserNotify *MessagesDialog::createUserNotify(QObject *parent)